31210030021 has 8 divisors (see below), whose sum is σ = 34281040320. Its totient is φ = 28281857472.

The previous prime is 31210030003. The next prime is 31210030043. The reversal of 31210030021 is 12003001213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31210030021 - 2¹¹ = 31210027973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31210029983 and 31210030010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31210030121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35708980 + ... + 35709853.

It is an arithmetic number, because the mean of its divisors is an integer number (4285130040).

Almost surely, 2^31210030021 is an apocalyptic number.

It is an amenable number.

31210030021 is a deficient number, since it is larger than the sum of its proper divisors (3071010299).

31210030021 is a wasteful number, since it uses less digits than its factorization.

31210030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71418875.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 31210030021 its reverse (12003001213), we get a palindrome (43213031234).

The spelling of 31210030021 in words is "thirty-one billion, two hundred ten million, thirty thousand, twenty-one".