31543225051021 has 4 divisors (see below), whose sum is σ = 31855534210044. Its totient is φ = 31230915892000.

The previous prime is 31543225051003. The next prime is 31543225051043. The reversal of 31543225051021 is 12015052234513.

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 25344569166921 + 6198655884100 = 5034339^2 + 2489710^2 .

It is a cyclic number.

It is not a de Polignac number, because 31543225051021 - 2⁴³ = 22747132028813 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 (31543225051081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156154579360 + ... + 156154579561.

It is an arithmetic number, because the mean of its divisors is an integer number (7963883552511).

Almost surely, 2^{31543225051021} is an apocalyptic number.

It is an amenable number.

31543225051021 is a deficient number, since it is larger than the sum of its proper divisors (312309159023).

31543225051021 is a wasteful number, since it uses less digits than its factorization.

31543225051021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312309159022.

The product of its (nonzero) digits is 36000, while the sum is 34.

Adding to 31543225051021 its reverse (12015052234513), we get a palindrome (43558277285534).

The spelling of 31543225051021 in words is "thirty-one trillion, five hundred forty-three billion, two hundred twenty-five million, fifty-one thousand, twenty-one".