31211011213 has 8 divisors (see below), whose sum is σ = 31680051480. Its totient is φ = 30745108800.

The previous prime is 31211011133. The next prime is 31211011309.

It is a happy number.

31211011213 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 26737809289 + 4473201924 = 163517^2 + 66882^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31211011213 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 (31211011313) 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, 764418 + ... + 804211.

It is an arithmetic number, because the mean of its divisors is an integer number (3960006435).

Almost surely, 2^31211011213 is an apocalyptic number.

It is an amenable number.

31211011213 is a deficient number, since it is larger than the sum of its proper divisors (469040267).

31211011213 is a wasteful number, since it uses less digits than its factorization.

31211011213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568927.

The product of its (nonzero) digits is 36, while the sum is 16.

It can be divided in two parts, 312110 and 11213, that added together give a palindrome (323323).

The spelling of 31211011213 in words is "thirty-one billion, two hundred eleven million, eleven thousand, two hundred thirteen".