31032123021 has 12 divisors (see below), whose sum is σ = 44827821948. Its totient is φ = 20686400064.

The previous prime is 31032123013. The next prime is 31032123047. The reversal of 31032123021 is 12032123013.

31032123021 is a `hidden beast` number, since 310 + 321 + 2 + 30 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 27089538921 + 3942584100 = 164589^2 + 62790^2 .

It is not a de Polignac number, because 31032123021 - 2³ = 31032123013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31032122985 and 31032123003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31032123721) 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, 17680 + ... + 249753.

It is an arithmetic number, because the mean of its divisors is an integer number (3735651829).

Almost surely, 2^31032123021 is an apocalyptic number.

It is an amenable number.

31032123021 is a deficient number, since it is larger than the sum of its proper divisors (13795698927).

31032123021 is a wasteful number, since it uses less digits than its factorization.

31032123021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280332 (or 280329 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31032123021 its reverse (12032123013), we get a palindrome (43064246034).

The spelling of 31032123021 in words is "thirty-one billion, thirty-two million, one hundred twenty-three thousand, twenty-one".