31011043021 has 48 divisors (see below), whose sum is σ = 38967297600. Its totient is φ = 24525752832.

The previous prime is 31011042967. The next prime is 31011043061. The reversal of 31011043021 is 12034011013.

It is not a de Polignac number, because 31011043021 - 2⁷ = 31011042893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31011042986 and 31011043004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31011043061) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17333395 + ... + 17335183.

It is an arithmetic number, because the mean of its divisors is an integer number (811818700).

Almost surely, 2^31011043021 is an apocalyptic number.

It is an amenable number.

31011043021 is a deficient number, since it is larger than the sum of its proper divisors (7956254579).

31011043021 is a wasteful number, since it uses less digits than its factorization.

31011043021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2298 (or 2291 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31011043021 its reverse (12034011013), we get a palindrome (43045054034).

The spelling of 31011043021 in words is "thirty-one billion, eleven million, forty-three thousand, twenty-one".