22001222220021 has 64 divisors (see below), whose sum is σ = 35747326771200. Its totient is φ = 13262914857600.

The previous prime is 22001222220011. The next prime is 22001222220037. The reversal of 22001222220021 is 12002222210022.

22001222220021 is a `hidden beast` number, since 2 + 200 + 1 + 222 + 220 + 0 + 21 = 666.

It is not a de Polignac number, because 22001222220021 - 2⁶ = 22001222219957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22001222219976 and 22001222220003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001222220011) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1094197050 + ... + 1094217156.

It is an arithmetic number, because the mean of its divisors is an integer number (558551980800).

Almost surely, 2^{22001222220021} is an apocalyptic number.

It is an amenable number.

22001222220021 is a deficient number, since it is larger than the sum of its proper divisors (13746104551179).

22001222220021 is a wasteful number, since it uses less digits than its factorization.

22001222220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39607 (or 39601 counting only the distinct ones).

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

Adding to 22001222220021 its reverse (12002222210022), we get a palindrome (34003444430043).

Subtracting from 22001222220021 its reverse (12002222210022), we obtain a palindrome (9999000009999).

It can be divided in two parts, 2200 and 1222220021, that added together give a palindrome (1222222221).

The spelling of 22001222220021 in words is "twenty-two trillion, one billion, two hundred twenty-two million, two hundred twenty thousand, twenty-one".