221221022022 has 128 divisors (see below), whose sum is σ = 660053560320. Its totient is φ = 53039992320.

The previous prime is 221221021993. The next prime is 221221022027. The reversal of 221221022022 is 220220122122.

221221022022 is a `hidden beast` number, since 2 + 212 + 210 + 220 + 22 = 666.

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 = 221221021986 and 221221022004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221022027) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1992243 + ... + 2100350.

It is an arithmetic number, because the mean of its divisors is an integer number (5156668440).

Almost surely, 2^221221022022 is an apocalyptic number.

221221022022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221221022022 is an abundant number, since it is smaller than the sum of its proper divisors (438832538298).

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

221221022022 is a wasteful number, since it uses less digits than its factorization.

221221022022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4092635 (or 4092629 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 221221022022 its reverse (220220122122), we get a palindrome (441441144144).

The spelling of 221221022022 in words is "two hundred twenty-one billion, two hundred twenty-one million, twenty-two thousand, twenty-two".