31021004243 has 4 divisors (see below), whose sum is σ = 31040802240. Its totient is φ = 31001206248.

The previous prime is 31021004207. The next prime is 31021004281. The reversal of 31021004243 is 34240012013.

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

It is a cyclic number.

It is not a de Polignac number, because 31021004243 - 2¹² = 31021000147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31021004543) 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, 9896648 + ... + 9899781.

It is an arithmetic number, because the mean of its divisors is an integer number (7760200560).

Almost surely, 2^31021004243 is an apocalyptic number.

31021004243 is a deficient number, since it is larger than the sum of its proper divisors (19797997).

31021004243 is a wasteful number, since it uses less digits than its factorization.

31021004243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19797996.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31021004243 its reverse (34240012013), we get a palindrome (65261016256).

The spelling of 31021004243 in words is "thirty-one billion, twenty-one million, four thousand, two hundred forty-three".