31010345221 has 16 divisors (see below), whose sum is σ = 32438386800. Its totient is φ = 29642222400.

The previous prime is 31010345207. The next prime is 31010345237. The reversal of 31010345221 is 12254301013.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2891750625 + 28118594596 = 53775^2 + 167686^2 .

It is not a de Polignac number, because 31010345221 - 2⁹ = 31010344709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31010345192 and 31010345201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31010745221) 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, 2456995 + ... + 2469583.

It is an arithmetic number, because the mean of its divisors is an integer number (2027399175).

Almost surely, 2^31010345221 is an apocalyptic number.

It is an amenable number.

31010345221 is a deficient number, since it is larger than the sum of its proper divisors (1428041579).

31010345221 is an equidigital number, since it uses as much as digits as its factorization.

31010345221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12777 (or 12719 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 31010345221 its reverse (12254301013), we get a palindrome (43264646234).

The spelling of 31010345221 in words is "thirty-one billion, ten million, three hundred forty-five thousand, two hundred twenty-one".