221221301022 has 24 divisors (see below), whose sum is σ = 480025048464. Its totient is φ = 73630859904.

The previous prime is 221221300903. The next prime is 221221301029. The reversal of 221221301022 is 220103122122.

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 = 221221300986 and 221221301004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221301029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9118698 + ... + 9142925.

It is an arithmetic number, because the mean of its divisors is an integer number (20001043686).

Almost surely, 2^221221301022 is an apocalyptic number.

221221301022 is an abundant number, since it is smaller than the sum of its proper divisors (258803747442).

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

221221301022 is a wasteful number, since it uses less digits than its factorization.

221221301022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18262304 (or 18262301 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 221221301022 its reverse (220103122122), we get a palindrome (441324423144).

The spelling of 221221301022 in words is "two hundred twenty-one billion, two hundred twenty-one million, three hundred one thousand, twenty-two".