131002021 has 4 divisors (see below), whose sum is σ = 131050732. Its totient is φ = 130953312.

The previous prime is 131002009. The next prime is 131002033. The reversal of 131002021 is 120200131.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (131002009) and next prime (131002033).

It can be written as a sum of positive squares in 2 ways, for example, as 110481121 + 20520900 = 10511^2 + 4530^2 .

It is a cyclic number.

It is not a de Polignac number, because 131002021 - 2⁵ = 131001989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131001989 and 131002007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131002121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20070 + ... + 25783.

It is an arithmetic number, because the mean of its divisors is an integer number (32762683).

Almost surely, 2^131002021 is an apocalyptic number.

It is an amenable number.

131002021 is a deficient number, since it is larger than the sum of its proper divisors (48711).

131002021 is an equidigital number, since it uses as much as digits as its factorization.

131002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48710.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 131002021 is about 11445.6114297140. The cubic root of 131002021 is about 507.8779195454.

Adding to 131002021 its reverse (120200131), we get a palindrome (251202152).

The spelling of 131002021 in words is "one hundred thirty-one million, two thousand, twenty-one".