222122010121221 has 16 divisors (see below), whose sum is σ = 339693553737344. Its totient is φ = 126468643201344.

The previous prime is 222122010121199. The next prime is 222122010121223. The reversal of 222122010121221 is 122121010221222.

It is not a de Polignac number, because 222122010121221 - 2⁵ = 222122010121189 is a prime.

It is a super-2 number, since 2×222122010121221² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222122010121223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19092482590 + ... + 19092494223.

It is an arithmetic number, because the mean of its divisors is an integer number (21230847108584).

Almost surely, 2^{222122010121221} is an apocalyptic number.

222122010121221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

222122010121221 is a deficient number, since it is larger than the sum of its proper divisors (117571543616123).

222122010121221 is a wasteful number, since it uses less digits than its factorization.

222122010121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38184977100.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 222122010121221 its reverse (122121010221222), we get a palindrome (344243020342443).

The spelling of 222122010121221 in words is "two hundred twenty-two trillion, one hundred twenty-two billion, ten million, one hundred twenty-one thousand, two hundred twenty-one".