21037174440 has 32 divisors (see below), whose sum is σ = 63111523680. Its totient is φ = 5609913152.

The previous prime is 21037174427. The next prime is 21037174441. The reversal of 21037174440 is 4447173012.

It is not an unprimeable number, because it can be changed into a prime (21037174441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87654774 + ... + 87655013.

It is an arithmetic number, because the mean of its divisors is an integer number (1972235115).

Almost surely, 2^21037174440 is an apocalyptic number.

21037174440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21037174440 is an abundant number, since it is smaller than the sum of its proper divisors (42074349240).

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

21037174440 is a wasteful number, since it uses less digits than its factorization.

21037174440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175309801 (or 175309797 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 33.

The spelling of 21037174440 in words is "twenty-one billion, thirty-seven million, one hundred seventy-four thousand, four hundred forty".