21122002122111 has 64 divisors (see below), whose sum is σ = 34932253847040. Its totient is φ = 12502862507520.

The previous prime is 21122002122107. The next prime is 21122002122167. The reversal of 21122002122111 is 11122120022112.

21122002122111 is a `hidden beast` number, since 21 + 1 + 220 + 0 + 212 + 211 + 1 = 666.

It is not a de Polignac number, because 21122002122111 - 2² = 21122002122107 is a prime.

It is a super-2 number, since 2×21122002122111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122002122181) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 374123761 + ... + 374180213.

It is an arithmetic number, because the mean of its divisors is an integer number (545816466360).

Almost surely, 2^{21122002122111} is an apocalyptic number.

21122002122111 is a deficient number, since it is larger than the sum of its proper divisors (13810251724929).

21122002122111 is a wasteful number, since it uses less digits than its factorization.

21122002122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85813 (or 85807 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21122002122111 its reverse (11122120022112), we get a palindrome (32244122144223).

The spelling of 21122002122111 in words is "twenty-one trillion, one hundred twenty-two billion, two million, one hundred twenty-two thousand, one hundred eleven".