31001012021 has 8 divisors (see below), whose sum is σ = 35431251840. Its totient is φ = 26571153168.

The previous prime is 31001012017. The next prime is 31001012033. The reversal of 31001012021 is 12021010013.

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

It is not a de Polignac number, because 31001012021 - 2² = 31001012017 is a prime.

It is a super-2 number, since 2×31001012021² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31001011993 and 31001012011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31001012041) 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 7 ways as a sum of consecutive naturals, for example, 108080 + ... + 271446.

It is an arithmetic number, because the mean of its divisors is an integer number (4428906480).

Almost surely, 2^31001012021 is an apocalyptic number.

It is an amenable number.

31001012021 is a deficient number, since it is larger than the sum of its proper divisors (4430239819).

31001012021 is a wasteful number, since it uses less digits than its factorization.

31001012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190483.

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

Adding to 31001012021 its reverse (12021010013), we get a palindrome (43022022034).

The spelling of 31001012021 in words is "thirty-one billion, one million, twelve thousand, twenty-one".