131021224 has 8 divisors (see below), whose sum is σ = 245664810. Its totient is φ = 65510608.

The previous prime is 131021167. The next prime is 131021239. The reversal of 131021224 is 422120131.

131021224 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 128097124 + 2924100 = 11318^2 + 1710^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×131021224² = 34333122276916352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131021198 and 131021207.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8188819 + ... + 8188834.

Almost surely, 2^131021224 is an apocalyptic number.

It is an amenable number.

131021224 is a deficient number, since it is larger than the sum of its proper divisors (114643586).

131021224 is a wasteful number, since it uses less digits than its factorization.

131021224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16377659 (or 16377655 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 131021224 is about 11446.4502794535. The cubic root of 131021224 is about 507.9027341834.

Adding to 131021224 its reverse (422120131), we get a palindrome (553141355).

The spelling of 131021224 in words is "one hundred thirty-one million, twenty-one thousand, two hundred twenty-four".