21572898199 has 4 divisors (see below), whose sum is σ = 21599111536. Its totient is φ = 21546684864.

The previous prime is 21572898181. The next prime is 21572898203. The reversal of 21572898199 is 99189827512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21572898199 - 2⁷ = 21572898071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21572898299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13105434 + ... + 13107079.

It is an arithmetic number, because the mean of its divisors is an integer number (5399777884).

Almost surely, 2^21572898199 is an apocalyptic number.

21572898199 is a deficient number, since it is larger than the sum of its proper divisors (26213337).

21572898199 is an equidigital number, since it uses as much as digits as its factorization.

21572898199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26213336.

The product of its digits is 6531840, while the sum is 61.

The spelling of 21572898199 in words is "twenty-one billion, five hundred seventy-two million, eight hundred ninety-eight thousand, one hundred ninety-nine".