21453869376 has 84 divisors (see below), whose sum is σ = 61936274400. Its totient is φ = 7099815168.

The previous prime is 21453869369. The next prime is 21453869377. The reversal of 21453869376 is 67396835412.

21453869376 is a `hidden beast` number, since 2 + 14 + 538 + 6 + 93 + 7 + 6 = 666.

It is a super-2 number, since 2×21453869376² (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 (21453869377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53916 + ... + 214043.

It is an arithmetic number, because the mean of its divisors is an integer number (737336600).

Almost surely, 2^21453869376 is an apocalyptic number.

It is an amenable number.

21453869376 is an abundant number, since it is smaller than the sum of its proper divisors (40482405024).

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

21453869376 is a wasteful number, since it uses less digits than its factorization.

21453869376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268116 (or 268103 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The spelling of 21453869376 in words is "twenty-one billion, four hundred fifty-three million, eight hundred sixty-nine thousand, three hundred seventy-six".