21021220022022 has 96 divisors (see below), whose sum is σ = 51849136924416. Its totient is φ = 6092833032000.

The previous prime is 21021220021969. The next prime is 21021220022081. The reversal of 21021220022022 is 22022002212012.

21021220022022 is a `hidden beast` number, since 2 + 10 + 212 + 200 + 220 + 22 = 666.

It is a super-2 number, since 2×21021220022022² (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).

It is a junction number, because it is equal to n+sod(n) for n = 21021220021986 and 21021220022004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 115129533 + ... + 115311975.

It is an arithmetic number, because the mean of its divisors is an integer number (540095176296).

Almost surely, 2^{21021220022022} is an apocalyptic number.

21021220022022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21021220022022 is an abundant number, since it is smaller than the sum of its proper divisors (30827916902394).

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

21021220022022 is a wasteful number, since it uses less digits than its factorization.

21021220022022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207786 (or 207783 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21021220022022 its reverse (22022002212012), we get a palindrome (43043222234034).

The spelling of 21021220022022 in words is "twenty-one trillion, twenty-one billion, two hundred twenty million, twenty-two thousand, twenty-two".