131020021 has 8 divisors (see below), whose sum is σ = 143892000. Its totient is φ = 118308240.

The previous prime is 131020013. The next prime is 131020031. The reversal of 131020021 is 120020131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131020021 - 2³ = 131020013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131020031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38331 + ... + 41608.

It is an arithmetic number, because the mean of its divisors is an integer number (17986500).

Almost surely, 2^131020021 is an apocalyptic number.

131020021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131020021 is a deficient number, since it is larger than the sum of its proper divisors (12871979).

131020021 is a wasteful number, since it uses less digits than its factorization.

131020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80099.

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

The square root of 131020021 is about 11446.3977302905. The cubic root of 131020021 is about 507.9011797053.

Adding to 131020021 its reverse (120020131), we get a palindrome (251040152).

The spelling of 131020021 in words is "one hundred thirty-one million, twenty thousand, twenty-one".