39121213 has 4 divisors (see below), whose sum is σ = 39672288. Its totient is φ = 38570140.

The previous prime is 39121169. The next prime is 39121217. The reversal of 39121213 is 31212193.

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 39121213 - 2⁹ = 39120701 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39121217) 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, 275431 + ... + 275572.

It is an arithmetic number, because the mean of its divisors is an integer number (9918072).

Almost surely, 2^39121213 is an apocalyptic number.

It is an amenable number.

39121213 is a deficient number, since it is larger than the sum of its proper divisors (551075).

39121213 is an equidigital number, since it uses as much as digits as its factorization.

39121213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551074.

The product of its digits is 324, while the sum is 22.

The square root of 39121213 is about 6254.6952763504. The cubic root of 39121213 is about 339.4721133492.

The spelling of 39121213 in words is "thirty-nine million, one hundred twenty-one thousand, two hundred thirteen".