39921212099 has 2 divisors, whose sum is σ = 39921212100. Its totient is φ = 39921212098.

The previous prime is 39921212069. The next prime is 39921212143. The reversal of 39921212099 is 99021212993.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39921212099 is a prime.

It is not a weakly prime, because it can be changed into another prime (39921212069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19960606049 + 19960606050.

It is an arithmetic number, because the mean of its divisors is an integer number (19960606050).

Almost surely, 2^39921212099 is an apocalyptic number.

39921212099 is a deficient number, since it is larger than the sum of its proper divisors (1).

39921212099 is an equidigital number, since it uses as much as digits as its factorization.

39921212099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 47.

The spelling of 39921212099 in words is "thirty-nine billion, nine hundred twenty-one million, two hundred twelve thousand, ninety-nine".