21358031344 has 40 divisors (see below), whose sum is σ = 44573365872. Its totient is φ = 9855559680.

The previous prime is 21358031323. The next prime is 21358031363. The reversal of 21358031344 is 44313085312.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1683264 + ... + 1695904.

Almost surely, 2^21358031344 is an apocalyptic number.

It is an amenable number.

21358031344 is an abundant number, since it is smaller than the sum of its proper divisors (23215334528).

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

21358031344 is a wasteful number, since it uses less digits than its factorization.

21358031344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20785 (or 20779 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 21358031344 in words is "twenty-one billion, three hundred fifty-eight million, thirty-one thousand, three hundred forty-four".