21111220121022 has 12 divisors (see below), whose sum is σ = 45740976928920. Its totient is φ = 7037073373668.

The previous prime is 21111220121021. The next prime is 21111220121171. The reversal of 21111220121022 is 22012102211112.

21111220121022 is a `hidden beast` number, since 211 + 1 + 1 + 220 + 1 + 210 + 22 = 666.

It is a super-2 number, since 2×21111220121022² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1172845562279 = 21111220121022 / (2 + 1 + 1 + 1 + 1 + 2 + 2 + 0 + 1 + 2 + 1 + 0 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21111220120986 and 21111220121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111220121021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 586422781122 + ... + 586422781157.

It is an arithmetic number, because the mean of its divisors is an integer number (3811748077410).

Almost surely, 2^{21111220121022} is an apocalyptic number.

21111220121022 is an abundant number, since it is smaller than the sum of its proper divisors (24629756807898).

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

21111220121022 is a wasteful number, since it uses less digits than its factorization.

21111220121022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172845562287 (or 1172845562284 counting only the distinct ones).

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

Adding to 21111220121022 its reverse (22012102211112), we get a palindrome (43123322332134).

The spelling of 21111220121022 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty million, one hundred twenty-one thousand, twenty-two".