22002100120021 has 24 divisors (see below), whose sum is σ = 25663602051360. Its totient is φ = 18807876716832.

The previous prime is 22002100120003. The next prime is 22002100120067. The reversal of 22002100120021 is 12002100120022.

It is a happy number.

It is not a de Polignac number, because 22002100120021 - 2¹⁷ = 22002099988949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22002100119983 and 22002100120010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22002100150021) 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, 145607710 + ... + 145758736.

It is an arithmetic number, because the mean of its divisors is an integer number (1069316752140).

Almost surely, 2^{22002100120021} is an apocalyptic number.

It is an amenable number.

22002100120021 is a deficient number, since it is larger than the sum of its proper divisors (3661501931339).

22002100120021 is a wasteful number, since it uses less digits than its factorization.

22002100120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159073 (or 159066 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22002100120021 its reverse (12002100120022), we get a palindrome (34004200240043).

Subtracting from 22002100120021 its reverse (12002100120022), we obtain a palindrome (9999999999999).

The spelling of 22002100120021 in words is "twenty-two trillion, two billion, one hundred million, one hundred twenty thousand, twenty-one".