131232021 has 32 divisors (see below), whose sum is σ = 187170816. Its totient is φ = 81648000.

The previous prime is 131232019. The next prime is 131232053. The reversal of 131232021 is 120232131.

It is not a de Polignac number, because 131232021 - 2¹ = 131232019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131232011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 484116 + ... + 484386.

It is an arithmetic number, because the mean of its divisors is an integer number (5849088).

Almost surely, 2^131232021 is an apocalyptic number.

It is an amenable number.

131232021 is a deficient number, since it is larger than the sum of its proper divisors (55938795).

131232021 is a wasteful number, since it uses less digits than its factorization.

131232021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 131232021 is about 11455.6545426265. The cubic root of 131232021 is about 508.1749725350.

Adding to 131232021 its reverse (120232131), we get a palindrome (251464152).

It can be divided in two parts, 1312 and 32021, that added together give a palindrome (33333).

The spelling of 131232021 in words is "one hundred thirty-one million, two hundred thirty-two thousand, twenty-one".