131407021 has 16 divisors (see below), whose sum is σ = 141134400. Its totient is φ = 121989888.

The previous prime is 131407019. The next prime is 131407037. The reversal of 131407021 is 120704131.

It is a cyclic number.

It is not a de Polignac number, because 131407021 - 2¹ = 131407019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131407021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131407051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221301 + ... + 221893.

It is an arithmetic number, because the mean of its divisors is an integer number (8820900).

Almost surely, 2^131407021 is an apocalyptic number.

It is an amenable number.

131407021 is a deficient number, since it is larger than the sum of its proper divisors (9727379).

131407021 is a wasteful number, since it uses less digits than its factorization.

131407021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 131407021 is about 11463.2901472483. The cubic root of 131407021 is about 508.4007586875.

The spelling of 131407021 in words is "one hundred thirty-one million, four hundred seven thousand, twenty-one".