21310131 has 8 divisors (see below), whose sum is σ = 28588480. Its totient is φ = 14119272.

The previous prime is 21310117. The next prime is 21310139. The reversal of 21310131 is 13101312.

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

It is not a de Polignac number, because 21310131 - 2¹⁰ = 21309107 is a prime.

It is a super-2 number, since 2×21310131² = 908243366474322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21310139) 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, 21301 + ... + 22278.

It is an arithmetic number, because the mean of its divisors is an integer number (3573560).

Almost surely, 2^21310131 is an apocalyptic number.

21310131 is a deficient number, since it is larger than the sum of its proper divisors (7278349).

21310131 is a wasteful number, since it uses less digits than its factorization.

21310131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43745.

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

The square root of 21310131 is about 4616.2897439394. The cubic root of 21310131 is about 277.2439257698.

Adding to 21310131 its reverse (13101312), we get a palindrome (34411443).

It can be divided in two parts, 2 and 1310131, that multiplied together give a palindrome (2620262).

The spelling of 21310131 in words is "twenty-one million, three hundred ten thousand, one hundred thirty-one".