31030130021 has 16 divisors (see below), whose sum is σ = 33986684160. Its totient is φ = 28096385280.

The previous prime is 31030130009. The next prime is 31030130057. The reversal of 31030130021 is 12003103013.

It is a cyclic number.

It is not a de Polignac number, because 31030130021 - 2³⁰ = 29956388197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31030129978 and 31030130005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31039130021) 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, 3455225 + ... + 3464193.

It is an arithmetic number, because the mean of its divisors is an integer number (2124167760).

Almost surely, 2^31030130021 is an apocalyptic number.

It is an amenable number.

31030130021 is a deficient number, since it is larger than the sum of its proper divisors (2956554139).

31030130021 is a wasteful number, since it uses less digits than its factorization.

31030130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10204.

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 31030130021 its reverse (12003103013), we get a palindrome (43033233034).

It can be divided in two parts, 31030 and 130021, that added together give a 5-th power (161051 = 11⁵).

The spelling of 31030130021 in words is "thirty-one billion, thirty million, one hundred thirty thousand, twenty-one".