31244120340021 has 20 divisors (see below), whose sum is σ = 46674569076300. Its totient is φ = 20828854143936.

The previous prime is 31244120339933. The next prime is 31244120340077. The reversal of 31244120340021 is 12004302144213.

31244120340021 is a `hidden beast` number, since 3 + 1 + 244 + 12 + 0 + 3 + 400 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18179257073796 + 13064863266225 = 4263714^2 + 3614535^2 .

It is not a de Polignac number, because 31244120340021 - 2²² = 31244116145717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31244120340221) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2134206 + ... + 8187983.

It is an arithmetic number, because the mean of its divisors is an integer number (2333728453815).

Almost surely, 2^{31244120340021} is an apocalyptic number.

It is an amenable number.

31244120340021 is a deficient number, since it is larger than the sum of its proper divisors (15430448736279).

31244120340021 is a wasteful number, since it uses less digits than its factorization.

31244120340021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10359570 (or 10359561 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 31244120340021 its reverse (12004302144213), we get a palindrome (43248422484234).

The spelling of 31244120340021 in words is "thirty-one trillion, two hundred forty-four billion, one hundred twenty million, three hundred forty thousand, twenty-one".