21696228053 has 4 divisors (see below), whose sum is σ = 22972476780. Its totient is φ = 20419979328.

The previous prime is 21696228023. The next prime is 21696228089. The reversal of 21696228053 is 35082269612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6358148644 + 15338079409 = 79738^2 + 123847^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21696228053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21696227995 and 21696228013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21696228023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 638124338 + ... + 638124371.

It is an arithmetic number, because the mean of its divisors is an integer number (5743119195).

Almost surely, 2^21696228053 is an apocalyptic number.

It is an amenable number.

21696228053 is a deficient number, since it is larger than the sum of its proper divisors (1276248727).

21696228053 is a wasteful number, since it uses less digits than its factorization.

21696228053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276248726.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 21696228053 in words is "twenty-one billion, six hundred ninety-six million, two hundred twenty-eight thousand, fifty-three".