131221310 has 32 divisors (see below), whose sum is σ = 262051200. Its totient is φ = 46905760.

The previous prime is 131221303. The next prime is 131221313. The reversal of 131221310 is 13122131.

It is a super-2 number, since 2×131221310² = 34438064396232200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221313) 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, 3620 + ... + 16599.

It is an arithmetic number, because the mean of its divisors is an integer number (8189100).

Almost surely, 2^131221310 is an apocalyptic number.

131221310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

131221310 is a deficient number, since it is larger than the sum of its proper divisors (130829890).

131221310 is a wasteful number, since it uses less digits than its factorization.

131221310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20296.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 131221310 is about 11455.1870347018. The cubic root of 131221310 is about 508.1611466151.

Adding to 131221310 its reverse (13122131), we get a palindrome (144343441).

It can be divided in two parts, 1312 and 21310, that added together give a palindrome (22622).

The spelling of 131221310 in words is "one hundred thirty-one million, two hundred twenty-one thousand, three hundred ten".