31323214213 has 4 divisors (see below), whose sum is σ = 31341290508. Its totient is φ = 31305137920.

The previous prime is 31323214211. The next prime is 31323214253. The reversal of 31323214213 is 31241232313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31241232313 = 139 ⋅224757067.

It can be written as a sum of positive squares in 2 ways, for example, as 11300115204 + 20023099009 = 106302^2 + 141503^2 .

It is a cyclic number.

It is not a de Polignac number, because 31323214213 - 2¹ = 31323214211 is a prime.

It is a super-2 number, since 2×31323214213² (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 (31323214211) 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, 9035548 + ... + 9039013.

It is an arithmetic number, because the mean of its divisors is an integer number (7835322627).

Almost surely, 2^31323214213 is an apocalyptic number.

It is an amenable number.

31323214213 is a deficient number, since it is larger than the sum of its proper divisors (18076295).

31323214213 is a wasteful number, since it uses less digits than its factorization.

31323214213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18076294.

The product of its digits is 2592, while the sum is 25.

Adding to 31323214213 its reverse (31241232313), we get a palindrome (62564446526).

The spelling of 31323214213 in words is "thirty-one billion, three hundred twenty-three million, two hundred fourteen thousand, two hundred thirteen".