39999131021213 has 32 divisors (see below), whose sum is σ = 50622176005632. Its totient is φ = 30758370739200.

The previous prime is 39999131021209. The next prime is 39999131021243. The reversal of 39999131021213 is 31212013199993.

It is not a de Polignac number, because 39999131021213 - 2² = 39999131021209 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39999131021203) 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, 19400408 + ... + 21362913.

It is an arithmetic number, because the mean of its divisors is an integer number (1581943000176).

Almost surely, 2^{39999131021213} is an apocalyptic number.

It is an amenable number.

39999131021213 is a deficient number, since it is larger than the sum of its proper divisors (10623044984419).

39999131021213 is a wasteful number, since it uses less digits than its factorization.

39999131021213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40763645.

The product of its (nonzero) digits is 708588, while the sum is 53.

The spelling of 39999131021213 in words is "thirty-nine trillion, nine hundred ninety-nine billion, one hundred thirty-one million, twenty-one thousand, two hundred thirteen".