21450545623 has 32 divisors (see below), whose sum is σ = 24218611200. Its totient is φ = 18862091136.

The previous prime is 21450545609. The next prime is 21450545639. The reversal of 21450545623 is 32654505412.

It is a cyclic number.

It is not a de Polignac number, because 21450545623 - 2⁹ = 21450545111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450545693) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11414998 + ... + 11416876.

It is an arithmetic number, because the mean of its divisors is an integer number (756831600).

Almost surely, 2^21450545623 is an apocalyptic number.

21450545623 is a deficient number, since it is larger than the sum of its proper divisors (2768065577).

21450545623 is a wasteful number, since it uses less digits than its factorization.

21450545623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2311.

The product of its (nonzero) digits is 144000, while the sum is 37.

The spelling of 21450545623 in words is "twenty-one billion, four hundred fifty million, five hundred forty-five thousand, six hundred twenty-three".