22100010021 has 6 divisors (see below), whose sum is σ = 31922236710. Its totient is φ = 14733340008.

The previous prime is 22100010017. The next prime is 22100010041. The reversal of 22100010021 is 12001000122.

It can be written as a sum of positive squares in only one way, i.e., 15119407521 + 6980602500 = 122961^2 + 83550^2 .

It is not a de Polignac number, because 22100010021 - 2² = 22100010017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2455556669 = 22100010021 / (2 + 2 + 1 + 0 + 0 + 0 + 1 + 0 + 0 + 2 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 22100009985 and 22100010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22100010001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1227778326 + ... + 1227778343.

It is an arithmetic number, because the mean of its divisors is an integer number (5320372785).

Almost surely, 2^22100010021 is an apocalyptic number.

It is an amenable number.

22100010021 is a deficient number, since it is larger than the sum of its proper divisors (9822226689).

22100010021 is a wasteful number, since it uses less digits than its factorization.

22100010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2455556675 (or 2455556672 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 22100010021 its reverse (12001000122), we get a palindrome (34101010143).

The spelling of 22100010021 in words is "twenty-two billion, one hundred million, ten thousand, twenty-one".