31301223213 has 32 divisors (see below), whose sum is σ = 46151239680. Its totient is φ = 18751826880.

The previous prime is 31301223209. The next prime is 31301223241. The reversal of 31301223213 is 31232210313.

It is not a de Polignac number, because 31301223213 - 2² = 31301223209 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31301223213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31301223203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 170968 + ... + 303038.

It is an arithmetic number, because the mean of its divisors is an integer number (1442226240).

Almost surely, 2^31301223213 is an apocalyptic number.

It is an amenable number.

31301223213 is a deficient number, since it is larger than the sum of its proper divisors (14850016467).

31301223213 is a wasteful number, since it uses less digits than its factorization.

31301223213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132249.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31301223213 its reverse (31232210313), we get a palindrome (62533433526).

The spelling of 31301223213 in words is "thirty-one billion, three hundred one million, two hundred twenty-three thousand, two hundred thirteen".