31010030021 has 8 divisors (see below), whose sum is σ = 32858916480. Its totient is φ = 29163895488.

The previous prime is 31010029997. The next prime is 31010030047. The reversal of 31010030021 is 12003001013.

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

It is not a de Polignac number, because 31010030021 - 2²² = 31005835717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31010029984 and 31010030011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31010030221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 664751 + ... + 709868.

It is an arithmetic number, because the mean of its divisors is an integer number (4107364560).

Almost surely, 2^31010030021 is an apocalyptic number.

It is an amenable number.

31010030021 is a deficient number, since it is larger than the sum of its proper divisors (1848886459).

31010030021 is a wasteful number, since it uses less digits than its factorization.

31010030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375963.

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 31010030021 its reverse (12003001013), we get a palindrome (43013031034).

The spelling of 31010030021 in words is "thirty-one billion, ten million, thirty thousand, twenty-one".