21012415199 has 2 divisors, whose sum is σ = 21012415200. Its totient is φ = 21012415198.

The previous prime is 21012415183. The next prime is 21012415231. The reversal of 21012415199 is 99151421012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21012415199 - 2⁴ = 21012415183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012445199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506207599 + 10506207600.

It is an arithmetic number, because the mean of its divisors is an integer number (10506207600).

Almost surely, 2^21012415199 is an apocalyptic number.

21012415199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012415199 is an equidigital number, since it uses as much as digits as its factorization.

21012415199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 35.

The spelling of 21012415199 in words is "twenty-one billion, twelve million, four hundred fifteen thousand, one hundred ninety-nine".