531342386645021 has 24 divisors (see below), whose sum is σ = 620165467193760. Its totient is φ = 453909548584800.

The previous prime is 531342386644963. The next prime is 531342386645033. The reversal of 531342386645021 is 120546683243135.

It is not a de Polignac number, because 531342386645021 - 2¹⁰ = 531342386643997 is a prime.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531342386645051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43395275 + ... + 54275543.

It is an arithmetic number, because the mean of its divisors is an integer number (25840227799740).

Almost surely, 2^{531342386645021} is an apocalyptic number.

It is an amenable number.

531342386645021 is a deficient number, since it is larger than the sum of its proper divisors (88823080548739).

531342386645021 is a wasteful number, since it uses less digits than its factorization.

531342386645021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10883625 (or 10883618 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 53.

The spelling of 531342386645021 in words is "five hundred thirty-one trillion, three hundred forty-two billion, three hundred eighty-six million, six hundred forty-five thousand, twenty-one".