221211221022 has 128 divisors (see below), whose sum is σ = 574658219520. Its totient is φ = 62330181120.

The previous prime is 221211220963. The next prime is 221211221047. The reversal of 221211221022 is 220122112122.

It is a happy number.

221211221022 is a `hidden beast` number, since 221 + 211 + 2 + 210 + 22 = 666.

221211221022 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 221211220986 and 221211221004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 706168 + ... + 970100.

It is an arithmetic number, because the mean of its divisors is an integer number (4489517340).

Almost surely, 2^221211221022 is an apocalyptic number.

221211221022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 221211221022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287329109760).

221211221022 is an abundant number, since it is smaller than the sum of its proper divisors (353446998498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221211221022 is a wasteful number, since it uses less digits than its factorization.

221211221022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264055 (or 264049 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221211221022 its reverse (220122112122), we get a palindrome (441333333144).

The spelling of 221211221022 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred twenty-one thousand, twenty-two".