21045452344 has 16 divisors (see below), whose sum is σ = 45097398000. Its totient is φ = 9019479552.

The previous prime is 21045452327. The next prime is 21045452347. The reversal of 21045452344 is 44325454012.

It is a super-2 number, since 2×21045452344² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21045452347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187905769 + ... + 187905880.

It is an arithmetic number, because the mean of its divisors is an integer number (2818587375).

Almost surely, 2^21045452344 is an apocalyptic number.

It is an amenable number.

21045452344 is an abundant number, since it is smaller than the sum of its proper divisors (24051945656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21045452344 is a wasteful number, since it uses less digits than its factorization.

21045452344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375811662 (or 375811658 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 34.

The spelling of 21045452344 in words is "twenty-one billion, forty-five million, four hundred fifty-two thousand, three hundred forty-four".