31020130221 has 16 divisors (see below), whose sum is σ = 42533812800. Its totient is φ = 20101144448.

The previous prime is 31020130201. The next prime is 31020130223. The reversal of 31020130221 is 12203102013.

It is a cyclic number.

It is not a de Polignac number, because 31020130221 - 2⁹ = 31020129709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31020130221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020130223) 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, 968826 + ... + 1000331.

It is an arithmetic number, because the mean of its divisors is an integer number (2658363300).

Almost surely, 2^31020130221 is an apocalyptic number.

It is an amenable number.

31020130221 is a deficient number, since it is larger than the sum of its proper divisors (11513682579).

31020130221 is a wasteful number, since it uses less digits than its factorization.

31020130221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969308.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 31020130221 its reverse (12203102013), we get a palindrome (43223232234).

The spelling of 31020130221 in words is "thirty-one billion, twenty million, one hundred thirty thousand, two hundred twenty-one".