131340021 has 16 divisors (see below), whose sum is σ = 176938944. Its totient is φ = 86655744.

The previous prime is 131340007. The next prime is 131340023. The reversal of 131340021 is 120043131.

It is not a de Polignac number, because 131340021 - 2¹³ = 131331829 is a prime.

It is a super-2 number, since 2×131340021² = 34500402232560882, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131340023) 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, 164395 + ... + 165191.

It is an arithmetic number, because the mean of its divisors is an integer number (11058684).

Almost surely, 2^131340021 is an apocalyptic number.

It is an amenable number.

131340021 is a deficient number, since it is larger than the sum of its proper divisors (45598923).

131340021 is a wasteful number, since it uses less digits than its factorization.

131340021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300.

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

The square root of 131340021 is about 11460.3674024876. The cubic root of 131340021 is about 508.3143385419.

Adding to 131340021 its reverse (120043131), we get a palindrome (251383152).

The spelling of 131340021 in words is "one hundred thirty-one million, three hundred forty thousand, twenty-one".