31003023213 has 80 divisors (see below), whose sum is σ = 50181120000. Its totient is φ = 19019072160.

The previous prime is 31003023209. The next prime is 31003023221. The reversal of 31003023213 is 31232030013.

31003023213 is a `hidden beast` number, since 310 + 0 + 30 + 2 + 321 + 3 = 666.

It is not a de Polignac number, because 31003023213 - 2² = 31003023209 is a prime.

It is a super-2 number, since 2×31003023213² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31003023203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 10336288 + ... + 10339286.

It is an arithmetic number, because the mean of its divisors is an integer number (627264000).

Almost surely, 2^31003023213 is an apocalyptic number.

It is an amenable number.

31003023213 is a deficient number, since it is larger than the sum of its proper divisors (19178096787).

31003023213 is a wasteful number, since it uses less digits than its factorization.

31003023213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3244 (or 3235 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 31003023213 its reverse (31232030013), we get a palindrome (62235053226).

The spelling of 31003023213 in words is "thirty-one billion, three million, twenty-three thousand, two hundred thirteen".