21653405167541 has 24 divisors (see below), whose sum is σ = 25548476823936. Its totient is φ = 18295033105440.

The previous prime is 21653405167531. The next prime is 21653405167571. The reversal of 21653405167541 is 14576150435612.

It is a de Polignac number, because none of the positive numbers 2^k-21653405167541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21653405167541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21653405167531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17049920 + ... + 18275846.

It is an arithmetic number, because the mean of its divisors is an integer number (1064519867664).

Almost surely, 2^{21653405167541} is an apocalyptic number.

It is an amenable number.

21653405167541 is a deficient number, since it is larger than the sum of its proper divisors (3895071656395).

21653405167541 is a wasteful number, since it uses less digits than its factorization.

21653405167541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231089 (or 1231082 counting only the distinct ones).

The product of its (nonzero) digits is 3024000, while the sum is 50.

The spelling of 21653405167541 in words is "twenty-one trillion, six hundred fifty-three billion, four hundred five million, one hundred sixty-seven thousand, five hundred forty-one".