21003501344 has 24 divisors (see below), whose sum is σ = 47257878528. Its totient is φ = 9001500480.

The previous prime is 21003501319. The next prime is 21003501347. The reversal of 21003501344 is 44310530012.

It is a super-2 number, since 2×21003501344² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003501347) 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, 46882592 + ... + 46883039.

It is an arithmetic number, because the mean of its divisors is an integer number (1969078272).

Almost surely, 2^21003501344 is an apocalyptic number.

It is an amenable number.

21003501344 is an abundant number, since it is smaller than the sum of its proper divisors (26254377184).

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

21003501344 is an equidigital number, since it uses as much as digits as its factorization.

21003501344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93765648 (or 93765640 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The spelling of 21003501344 in words is "twenty-one billion, three million, five hundred one thousand, three hundred forty-four".