21350445504 has 28 divisors (see below), whose sum is σ = 56489720904. Its totient is φ = 7116815104.

The previous prime is 21350445499. The next prime is 21350445509. The reversal of 21350445504 is 40554405312.

It is an interprime number because it is at equal distance from previous prime (21350445499) and next prime (21350445509).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21350445509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55599927 + ... + 55600310.

Almost surely, 2^21350445504 is an apocalyptic number.

21350445504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21350445504 is an abundant number, since it is smaller than the sum of its proper divisors (35139275400).

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

21350445504 is a wasteful number, since it uses less digits than its factorization.

21350445504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111200252 (or 111200242 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 33.

The spelling of 21350445504 in words is "twenty-one billion, three hundred fifty million, four hundred forty-five thousand, five hundred four".