131211021 has 16 divisors (see below), whose sum is σ = 184872960. Its totient is φ = 82608240.

The previous prime is 131211013. The next prime is 131211043. The reversal of 131211021 is 120112131.

It is not a de Polignac number, because 131211021 - 2³ = 131211013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131210988 and 131211006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131210021) 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, 6585 + ... + 17486.

It is an arithmetic number, because the mean of its divisors is an integer number (11554560).

Almost surely, 2^131211021 is an apocalyptic number.

It is an amenable number.

131211021 is a deficient number, since it is larger than the sum of its proper divisors (53661939).

131211021 is a wasteful number, since it uses less digits than its factorization.

131211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24176.

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

The square root of 131211021 is about 11454.7379280366. The cubic root of 131211021 is about 508.1478647107.

Adding to 131211021 its reverse (120112131), we get a palindrome (251323152).

It can be divided in two parts, 1312110 and 21, that added together give a palindrome (1312131).

The spelling of 131211021 in words is "one hundred thirty-one million, two hundred eleven thousand, twenty-one".