21664357053 has 8 divisors (see below), whose sum is σ = 28914441600. Its totient is φ = 14428588608.

The previous prime is 21664357027. The next prime is 21664357097. The reversal of 21664357053 is 35075346612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21664357053 - 2¹³ = 21664348861 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21664356996 and 21664357014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21664357453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3575493 + ... + 3581546.

It is an arithmetic number, because the mean of its divisors is an integer number (3614305200).

Almost surely, 2^21664357053 is an apocalyptic number.

It is an amenable number.

21664357053 is a deficient number, since it is larger than the sum of its proper divisors (7250084547).

21664357053 is a wasteful number, since it uses less digits than its factorization.

21664357053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7158051.

The product of its (nonzero) digits is 453600, while the sum is 42.

The spelling of 21664357053 in words is "twenty-one billion, six hundred sixty-four million, three hundred fifty-seven thousand, fifty-three".