21121202112222 has 32 divisors (see below), whose sum is σ = 44079475765248. Its totient is φ = 6734228298336.

The previous prime is 21121202112217. The next prime is 21121202112319. The reversal of 21121202112222 is 22221120212112.

It is a super-2 number, since 2×21121202112222² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13949928 + ... + 15389700.

It is an arithmetic number, because the mean of its divisors is an integer number (1377483617664).

Almost surely, 2^{21121202112222} is an apocalyptic number.

21121202112222 is an abundant number, since it is smaller than the sum of its proper divisors (22958273653026).

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

21121202112222 is a wasteful number, since it uses less digits than its factorization.

21121202112222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546104.

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

Adding to 21121202112222 its reverse (22221120212112), we get a palindrome (43342322324334).

The spelling of 21121202112222 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred two million, one hundred twelve thousand, two hundred twenty-two".