131221010 has 16 divisors (see below), whose sum is σ = 236972736. Its totient is φ = 52316208.

The previous prime is 131221009. The next prime is 131221021. The reversal of 131221010 is 10122131.

It is a junction number, because it is equal to n+sod(n) for n = 131220982 and 131221000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18302 + ... + 24441.

It is an arithmetic number, because the mean of its divisors is an integer number (14810796).

Almost surely, 2^131221010 is an apocalyptic number.

131221010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

131221010 is a deficient number, since it is larger than the sum of its proper divisors (105751726).

131221010 is a wasteful number, since it uses less digits than its factorization.

131221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43057.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 131221010 is about 11455.1739401896. The cubic root of 131221010 is about 508.1607593597.

Adding to 131221010 its reverse (10122131), we get a palindrome (141343141).

It can be divided in two parts, 1312 and 21010, that added together give a palindrome (22322).

The spelling of 131221010 in words is "one hundred thirty-one million, two hundred twenty-one thousand, ten".