21354743037400 has 24 divisors (see below), whose sum is σ = 49649777562420. Its totient is φ = 8541897214880.

The previous prime is 21354743037391. The next prime is 21354743037421. The reversal of 21354743037400 is 473034745312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53386857394 + ... + 53386857793.

Almost surely, 2^{21354743037400} is an apocalyptic number.

21354743037400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21354743037400 is an abundant number, since it is smaller than the sum of its proper divisors (28295034525020).

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

21354743037400 is a wasteful number, since it uses less digits than its factorization.

21354743037400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106773715203 (or 106773715194 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 43.

The spelling of 21354743037400 in words is "twenty-one trillion, three hundred fifty-four billion, seven hundred forty-three million, thirty-seven thousand, four hundred".