21099599583 has 16 divisors (see below), whose sum is σ = 28244614656. Its totient is φ = 14010534720.

The previous prime is 21099599531. The next prime is 21099599593. The reversal of 21099599583 is 38599599012.

It is not a de Polignac number, because 21099599583 - 2¹⁸ = 21099337439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21099599593) 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, 3219516 + ... + 3226062.

It is an arithmetic number, because the mean of its divisors is an integer number (1765288416).

Almost surely, 2^21099599583 is an apocalyptic number.

21099599583 is a deficient number, since it is larger than the sum of its proper divisors (7145015073).

21099599583 is a wasteful number, since it uses less digits than its factorization.

21099599583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10654.

The product of its (nonzero) digits is 7873200, while the sum is 60.

The spelling of 21099599583 in words is "twenty-one billion, ninety-nine million, five hundred ninety-nine thousand, five hundred eighty-three".