31010021001 has 12 divisors (see below), whose sum is σ = 46336813380. Its totient is φ = 19960473120.

The previous prime is 31010020933. The next prime is 31010021017. The reversal of 31010021001 is 10012001013.

It can be written as a sum of positive squares in 2 ways, for example, as 17976373776 + 13033647225 = 134076^2 + 114165^2 .

It is not a de Polignac number, because 31010021001 - 2¹⁰ = 31010019977 is a prime.

It is a super-2 number, since 2×31010021001² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (31010031001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59405910 + ... + 59406431.

It is an arithmetic number, because the mean of its divisors is an integer number (3861401115).

Almost surely, 2^31010021001 is an apocalyptic number.

It is an amenable number.

31010021001 is a deficient number, since it is larger than the sum of its proper divisors (15326792379).

31010021001 is a wasteful number, since it uses less digits than its factorization.

31010021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118812376 (or 118812373 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

Adding to 31010021001 its reverse (10012001013), we get a palindrome (41022022014).

The spelling of 31010021001 in words is "thirty-one billion, ten million, twenty-one thousand, one".