21653037453505 has 16 divisors (see below), whose sum is σ = 26075134368000. Its totient is φ = 17261543931840.

The previous prime is 21653037453461. The next prime is 21653037453511. The reversal of 21653037453505 is 50535473035612.

It is not a de Polignac number, because 21653037453505 - 2²⁹ = 21652500582593 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5061525 + ... + 8302114.

It is an arithmetic number, because the mean of its divisors is an integer number (1629695898000).

Almost surely, 2^{21653037453505} is an apocalyptic number.

It is an amenable number.

21653037453505 is a deficient number, since it is larger than the sum of its proper divisors (4422096914495).

21653037453505 is a wasteful number, since it uses less digits than its factorization.

21653037453505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13364784.

The product of its (nonzero) digits is 5670000, while the sum is 49.

The spelling of 21653037453505 in words is "twenty-one trillion, six hundred fifty-three billion, thirty-seven million, four hundred fifty-three thousand, five hundred five".