31345240352021 has 4 divisors (see below), whose sum is σ = 31381987410732. Its totient is φ = 31308493293312.

The previous prime is 31345240352017. The next prime is 31345240352029. The reversal of 31345240352021 is 12025304254313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12816614800900 + 18528625551121 = 3580030^2 + 4304489^2 .

It is a cyclic number.

It is not a de Polignac number, because 31345240352021 - 2² = 31345240352017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31345240352029) 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 3 ways as a sum of consecutive naturals, for example, 18373528076 + ... + 18373529781.

It is an arithmetic number, because the mean of its divisors is an integer number (7845496852683).

Almost surely, 2^{31345240352021} is an apocalyptic number.

It is an amenable number.

31345240352021 is a deficient number, since it is larger than the sum of its proper divisors (36747058711).

31345240352021 is an equidigital number, since it uses as much as digits as its factorization.

31345240352021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36747058710.

The product of its (nonzero) digits is 86400, while the sum is 35.

The spelling of 31345240352021 in words is "thirty-one trillion, three hundred forty-five billion, two hundred forty million, three hundred fifty-two thousand, twenty-one".