31120010221 has 4 divisors (see below), whose sum is σ = 31328869500. Its totient is φ = 30911150944.

The previous prime is 31120010203. The next prime is 31120010231. The reversal of 31120010221 is 12201002113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15497760100 + 15622250121 = 124490^2 + 124989^2 .

It is a cyclic number.

It is not a de Polignac number, because 31120010221 - 2¹³ = 31120002029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120010231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104429416 + ... + 104429713.

It is an arithmetic number, because the mean of its divisors is an integer number (7832217375).

Almost surely, 2^31120010221 is an apocalyptic number.

It is an amenable number.

31120010221 is a deficient number, since it is larger than the sum of its proper divisors (208859279).

31120010221 is a wasteful number, since it uses less digits than its factorization.

31120010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208859278.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 31120010221 its reverse (12201002113), we get a palindrome (43321012334).

The spelling of 31120010221 in words is "thirty-one billion, one hundred twenty million, ten thousand, two hundred twenty-one".