21120211122222 has 64 divisors (see below), whose sum is σ = 43365560716800. Its totient is φ = 6853314048000.

The previous prime is 21120211122221. The next prime is 21120211122233. The reversal of 21120211122222 is 22222111202112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120211122221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 253201279 + ... + 253284677.

It is an arithmetic number, because the mean of its divisors is an integer number (677586886200).

Almost surely, 2^{21120211122222} is an apocalyptic number.

21120211122222 is an abundant number, since it is smaller than the sum of its proper divisors (22245349594578).

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

21120211122222 is a wasteful number, since it uses less digits than its factorization.

21120211122222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85689.

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

Adding to 21120211122222 its reverse (22222111202112), we get a palindrome (43342322324334).

The spelling of 21120211122222 in words is "twenty-one trillion, one hundred twenty billion, two hundred eleven million, one hundred twenty-two thousand, two hundred twenty-two".