21211122112120 has 32 divisors (see below), whose sum is σ = 48147370114320. Its totient is φ = 8409365224960.

The previous prime is 21211122112087. The next prime is 21211122112129. The reversal of 21211122112120 is 2121122111212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211122112129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2346358546 + ... + 2346367585.

Almost surely, 2^{21211122112120} is an apocalyptic number.

21211122112120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211122112120 is an abundant number, since it is smaller than the sum of its proper divisors (26936248002200).

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

21211122112120 is a wasteful number, since it uses less digits than its factorization.

21211122112120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4692726255 (or 4692726251 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21211122112120 its reverse (2121122111212), we get a palindrome (23332244223332).

The spelling of 21211122112120 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty-two million, one hundred twelve thousand, one hundred twenty".