21122020102111 has 4 divisors (see below), whose sum is σ = 21123286958592. Its totient is φ = 21120753245632.

The previous prime is 21122020102097. The next prime is 21122020102151. The reversal of 21122020102111 is 11120102022112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21122020102111 - 2⁹ = 21122020101599 is a prime.

It is a super-2 number, since 2×21122020102111² (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 (21122020102151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 633403231 + ... + 633436576.

It is an arithmetic number, because the mean of its divisors is an integer number (5280821739648).

Almost surely, 2^{21122020102111} is an apocalyptic number.

21122020102111 is a deficient number, since it is larger than the sum of its proper divisors (1266856481).

21122020102111 is a wasteful number, since it uses less digits than its factorization.

21122020102111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266856480.

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

Adding to 21122020102111 its reverse (11120102022112), we get a palindrome (32242122124223).

The spelling of 21122020102111 in words is "twenty-one trillion, one hundred twenty-two billion, twenty million, one hundred two thousand, one hundred eleven".