39921212123 has 16 divisors (see below), whose sum is σ = 44398064256. Its totient is φ = 35656225920.

The previous prime is 39921212099. The next prime is 39921212143. The reversal of 39921212123 is 32121212993.

It is a cyclic number.

It is not a de Polignac number, because 39921212123 - 2¹² = 39921208027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39921212143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142211 + ... + 316332.

It is an arithmetic number, because the mean of its divisors is an integer number (2774879016).

Almost surely, 2^39921212123 is an apocalyptic number.

39921212123 is a deficient number, since it is larger than the sum of its proper divisors (4476852133).

39921212123 is a wasteful number, since it uses less digits than its factorization.

39921212123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458774.

The product of its digits is 11664, while the sum is 35.

The spelling of 39921212123 in words is "thirty-nine billion, nine hundred twenty-one million, two hundred twelve thousand, one hundred twenty-three".