31213500211213 has 4 divisors (see below), whose sum is σ = 31516543902688. Its totient is φ = 30910456519740.

The previous prime is 31213500211193. The next prime is 31213500211261. The reversal of 31213500211213 is 31211200531213.

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 31213500211213 - 2¹⁷ = 31213500080141 is a prime.

It is a super-2 number, since 2×31213500211213² (a number of 28 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 (31213500241213) 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, 151521845583 + ... + 151521845788.

It is an arithmetic number, because the mean of its divisors is an integer number (7879135975672).

Almost surely, 2^{31213500211213} is an apocalyptic number.

It is an amenable number.

31213500211213 is a deficient number, since it is larger than the sum of its proper divisors (303043691475).

31213500211213 is a wasteful number, since it uses less digits than its factorization.

31213500211213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303043691474.

The product of its (nonzero) digits is 1080, while the sum is 25.

Adding to 31213500211213 its reverse (31211200531213), we get a palindrome (62424700742426).

The spelling of 31213500211213 in words is "thirty-one trillion, two hundred thirteen billion, five hundred million, two hundred eleven thousand, two hundred thirteen".