21221022120111 has 96 divisors (see below), whose sum is σ = 35043623806464. Its totient is φ = 12248992800000.

The previous prime is 21221022120091. The next prime is 21221022120163. The reversal of 21221022120111 is 11102122012212.

21221022120111 is a `hidden beast` number, since 21 + 2 + 210 + 221 + 201 + 11 = 666.

It is not a de Polignac number, because 21221022120111 - 2⁹ = 21221022119599 is a prime.

It is a super-2 number, since 2×21221022120111² (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 (21221022120191) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3189688861 + ... + 3189695513.

It is an arithmetic number, because the mean of its divisors is an integer number (365037747984).

Almost surely, 2^{21221022120111} is an apocalyptic number.

21221022120111 is a deficient number, since it is larger than the sum of its proper divisors (13822601686353).

21221022120111 is a wasteful number, since it uses less digits than its factorization.

21221022120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12525 (or 12522 counting only the distinct ones).

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

Adding to 21221022120111 its reverse (11102122012212), we get a palindrome (32323144132323).

The spelling of 21221022120111 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-two million, one hundred twenty thousand, one hundred eleven".