21664005555053 has 16 divisors (see below), whose sum is σ = 22953828517440. Its totient is φ = 20389193510400.

The previous prime is 21664005555011. The next prime is 21664005555089. The reversal of 21664005555053 is 35055550046612.

It is a cyclic number.

It is not a de Polignac number, because 21664005555053 - 2¹⁰ = 21664005554029 is a prime.

It is a super-2 number, since 2×21664005555053² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21664005554989 and 21664005555007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21664005555553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15065618 + ... + 16440828.

It is an arithmetic number, because the mean of its divisors is an integer number (1434614282340).

Almost surely, 2^{21664005555053} is an apocalyptic number.

It is an amenable number.

21664005555053 is a deficient number, since it is larger than the sum of its proper divisors (1289822962387).

21664005555053 is a wasteful number, since it uses less digits than its factorization.

21664005555053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380668.

The product of its (nonzero) digits is 2700000, while the sum is 47.

The spelling of 21664005555053 in words is "twenty-one trillion, six hundred sixty-four billion, five million, five hundred fifty-five thousand, fifty-three".