22121201200021 has 48 divisors (see below), whose sum is σ = 29299861003392. Its totient is φ = 16222002969600.

The previous prime is 22121201200009. The next prime is 22121201200027. The reversal of 22121201200021 is 12000210212122.

It is a happy number.

It is not a de Polignac number, because 22121201200021 - 2²¹ = 22121199102869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22121201199968 and 22121201200004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121201200027) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 329244051 + ... + 329311231.

It is an arithmetic number, because the mean of its divisors is an integer number (610413770904).

Almost surely, 2^{22121201200021} is an apocalyptic number.

It is an amenable number.

22121201200021 is a deficient number, since it is larger than the sum of its proper divisors (7178659803371).

22121201200021 is a wasteful number, since it uses less digits than its factorization.

22121201200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82030 (or 82013 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22121201200021 its reverse (12000210212122), we get a palindrome (34121411412143).

The spelling of 22121201200021 in words is "twenty-two trillion, one hundred twenty-one billion, two hundred one million, two hundred thousand, twenty-one".