21653051452563 has 16 divisors (see below), whose sum is σ = 30390786984320. Its totient is φ = 13675368744576.

The previous prime is 21653051452523. The next prime is 21653051452573. The reversal of 21653051452563 is 36525415035612.

It is not a de Polignac number, because 21653051452563 - 2¹² = 21653051448467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21653051452523) 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, 103270 + ... + 6581547.

It is an arithmetic number, because the mean of its divisors is an integer number (1899424186520).

Almost surely, 2^{21653051452563} is an apocalyptic number.

21653051452563 is a deficient number, since it is larger than the sum of its proper divisors (8737735531757).

21653051452563 is a wasteful number, since it uses less digits than its factorization.

21653051452563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6741666.

The product of its (nonzero) digits is 3240000, while the sum is 48.

The spelling of 21653051452563 in words is "twenty-one trillion, six hundred fifty-three billion, fifty-one million, four hundred fifty-two thousand, five hundred sixty-three".