31204040213 has 4 divisors (see below), whose sum is σ = 31378364640. Its totient is φ = 31029715788.

The previous prime is 31204040207. The next prime is 31204040239.

31204040213 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31204040213 - 2¹⁶ = 31203974677 is a prime.

It is a super-2 number, since 2×31204040213² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31204040713) 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, 87161945 + ... + 87162302.

It is an arithmetic number, because the mean of its divisors is an integer number (7844591160).

Almost surely, 2^31204040213 is an apocalyptic number.

It is an amenable number.

31204040213 is a deficient number, since it is larger than the sum of its proper divisors (174324427).

31204040213 is a wasteful number, since it uses less digits than its factorization.

31204040213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174324426.

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

It can be divided in two parts, 312040 and 40213, that added together give a palindrome (352253).

The spelling of 31204040213 in words is "thirty-one billion, two hundred four million, forty thousand, two hundred thirteen".