31010210021 has 12 divisors (see below), whose sum is σ = 36081290700. Its totient is φ = 26574145920.

The previous prime is 31010210009. The next prime is 31010210047. The reversal of 31010210021 is 12001201013.

It can be written as a sum of positive squares in 2 ways, for example, as 17360961121 + 13649248900 = 131761^2 + 116830^2 .

It is not a de Polignac number, because 31010210021 - 2⁶ = 31010209957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31010209984 and 31010210011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31010210921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 153341 + ... + 292461.

It is an arithmetic number, because the mean of its divisors is an integer number (3006774225).

Almost surely, 2^31010210021 is an apocalyptic number.

It is an amenable number.

31010210021 is a deficient number, since it is larger than the sum of its proper divisors (5071080679).

31010210021 is a wasteful number, since it uses less digits than its factorization.

31010210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143684 (or 143677 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 31010210021 its reverse (12001201013), we get a palindrome (43011411034).

The spelling of 31010210021 in words is "thirty-one billion, ten million, two hundred ten thousand, twenty-one".