21221220200022 has 48 divisors (see below), whose sum is σ = 46081114794000. Its totient is φ = 7058087409600.

The previous prime is 21221220199999. The next prime is 21221220200027. The reversal of 21221220200022 is 22000202212212.

21221220200022 is a `hidden beast` number, since 2 + 1 + 221 + 220 + 200 + 0 + 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 = 21221220199968 and 21221220200004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221220200027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26373397 + ... + 27166127.

It is an arithmetic number, because the mean of its divisors is an integer number (960023224875).

Almost surely, 2^{21221220200022} is an apocalyptic number.

21221220200022 is an abundant number, since it is smaller than the sum of its proper divisors (24859894593978).

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

21221220200022 is a wasteful number, since it uses less digits than its factorization.

21221220200022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796029 (or 796026 counting only the distinct ones).

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

Adding to 21221220200022 its reverse (22000202212212), we get a palindrome (43221422412234).

The spelling of 21221220200022 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty million, two hundred thousand, twenty-two".