21011212022022 has 24 divisors (see below), whose sum is σ = 45524508873480. Its totient is φ = 7003704085440.

The previous prime is 21011212021939. The next prime is 21011212022027. The reversal of 21011212022022 is 22022021211012.

It is a happy number.

21011212022022 is a `hidden beast` number, since 210 + 1 + 1 + 212 + 0 + 220 + 22 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21011212021986 and 21011212022004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011212022027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1285429 + ... + 6608687.

It is an arithmetic number, because the mean of its divisors is an integer number (1896854536395).

Almost surely, 2^{21011212022022} is an apocalyptic number.

21011212022022 is an abundant number, since it is smaller than the sum of its proper divisors (24513296851458).

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

21011212022022 is a wasteful number, since it uses less digits than its factorization.

21011212022022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5542548 (or 5542545 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21011212022022 its reverse (22022021211012), we get a palindrome (43033233233034).

The spelling of 21011212022022 in words is "twenty-one trillion, eleven billion, two hundred twelve million, twenty-two thousand, twenty-two".