21122020012111 has 16 divisors (see below), whose sum is σ = 22144680876960. Its totient is φ = 20120407171200.

The previous prime is 21122020012109. The next prime is 21122020012187. The reversal of 21122020012111 is 11121002022112.

It is a cyclic number.

It is not a de Polignac number, because 21122020012111 - 2¹ = 21122020012109 is a prime.

It is a super-2 number, since 2×21122020012111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122020013111) 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, 11911980 + ... + 13569793.

It is an arithmetic number, because the mean of its divisors is an integer number (1384042554810).

Almost surely, 2^{21122020012111} is an apocalyptic number.

21122020012111 is a deficient number, since it is larger than the sum of its proper divisors (1022660864849).

21122020012111 is a wasteful number, since it uses less digits than its factorization.

21122020012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25482186.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21122020012111 its reverse (11121002022112), we get a palindrome (32243022034223).

The spelling of 21122020012111 in words is "twenty-one trillion, one hundred twenty-two billion, twenty million, twelve thousand, one hundred eleven".