31052740921 has 8 divisors (see below), whose sum is σ = 31399943400. Its totient is φ = 30706808832.

The previous prime is 31052740909. The next prime is 31052740967. The reversal of 31052740921 is 12904725013.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5099530921 + 25953210000 = 71411^2 + 161100^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 31052740921 - 2⁷ = 31052740793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31052140921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268396 + ... + 366253.

It is an arithmetic number, because the mean of its divisors is an integer number (3924992925).

Almost surely, 2^31052740921 is an apocalyptic number.

It is an amenable number.

31052740921 is a deficient number, since it is larger than the sum of its proper divisors (347202479).

31052740921 is a wasteful number, since it uses less digits than its factorization.

31052740921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635195.

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 31052740921 in words is "thirty-one billion, fifty-two million, seven hundred forty thousand, nine hundred twenty-one".