31000044021 has 8 divisors (see below), whose sum is σ = 41334242880. Its totient is φ = 20666270592.

The previous prime is 31000044007. The next prime is 31000044041. The reversal of 31000044021 is 12044000013.

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

It is not a de Polignac number, because 31000044021 - 2¹⁷ = 30999912949 is a prime.

It is a super-2 number, since 2×31000044021² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31000044041) 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, 156421 + ... + 294053.

It is an arithmetic number, because the mean of its divisors is an integer number (5166780360).

Almost surely, 2^31000044021 is an apocalyptic number.

It is an amenable number.

31000044021 is a deficient number, since it is larger than the sum of its proper divisors (10334198859).

31000044021 is a wasteful number, since it uses less digits than its factorization.

31000044021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212715.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 31000044021 its reverse (12044000013), we get a palindrome (43044044034).

The spelling of 31000044021 in words is "thirty-one billion, forty-four thousand, twenty-one".