21130131 has 8 divisors (see below), whose sum is σ = 30734784. Its totient is φ = 12806120.

The previous prime is 21130111. The next prime is 21130231. The reversal of 21130131 is 13103112.

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 21130131 - 2¹⁰ = 21129107 is a prime.

It is a super-2 number, since 2×21130131² = 892964872154322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21130111) 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, 320121 + ... + 320186.

It is an arithmetic number, because the mean of its divisors is an integer number (3841848).

Almost surely, 2^21130131 is an apocalyptic number.

21130131 is a deficient number, since it is larger than the sum of its proper divisors (9604653).

21130131 is a wasteful number, since it uses less digits than its factorization.

21130131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640321.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 21130131 is about 4596.7522230375. The cubic root of 21130131 is about 276.4611200505.

Adding to 21130131 its reverse (13103112), we get a palindrome (34233243).

The spelling of 21130131 in words is "twenty-one million, one hundred thirty thousand, one hundred thirty-one".