21198711599 has 32 divisors (see below), whose sum is σ = 24895309824. Its totient is φ = 17892483840.

The previous prime is 21198711539. The next prime is 21198711607. The reversal of 21198711599 is 99511789112.

It is not a de Polignac number, because 21198711599 - 2¹² = 21198707503 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21198711599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21198711509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 586739 + ... + 621819.

It is an arithmetic number, because the mean of its divisors is an integer number (777978432).

Almost surely, 2^21198711599 is an apocalyptic number.

21198711599 is a deficient number, since it is larger than the sum of its proper divisors (3696598225).

21198711599 is a wasteful number, since it uses less digits than its factorization.

21198711599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35207.

The product of its digits is 408240, while the sum is 53.

The spelling of 21198711599 in words is "twenty-one billion, one hundred ninety-eight million, seven hundred eleven thousand, five hundred ninety-nine".