31120130221 has 4 divisors (see below), whose sum is σ = 31514056000. Its totient is φ = 30726204444.

The previous prime is 31120130207. The next prime is 31120130227. The reversal of 31120130221 is 12203102113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31120130221 - 2⁵ = 31120130189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31120130195 and 31120130204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120130227) 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, 196962771 + ... + 196962928.

It is an arithmetic number, because the mean of its divisors is an integer number (7878514000).

Almost surely, 2^31120130221 is an apocalyptic number.

It is an amenable number.

31120130221 is a deficient number, since it is larger than the sum of its proper divisors (393925779).

31120130221 is an equidigital number, since it uses as much as digits as its factorization.

31120130221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393925778.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31120130221 its reverse (12203102113), we get a palindrome (43323232334).

The spelling of 31120130221 in words is "thirty-one billion, one hundred twenty million, one hundred thirty thousand, two hundred twenty-one".