21392799999 has 8 divisors (see below), whose sum is σ = 28530867840. Its totient is φ = 14258299416.

The previous prime is 21392799977. The next prime is 21392800003. The reversal of 21392799999 is 99999729312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21392799999 - 2²⁷ = 21258582271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21392799899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 877789 + ... + 901830.

It is an arithmetic number, because the mean of its divisors is an integer number (3566358480).

Almost surely, 2^21392799999 is an apocalyptic number.

21392799999 is a deficient number, since it is larger than the sum of its proper divisors (7138067841).

21392799999 is a wasteful number, since it uses less digits than its factorization.

21392799999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783629.

The product of its digits is 44641044, while the sum is 69.

The spelling of 21392799999 in words is "twenty-one billion, three hundred ninety-two million, seven hundred ninety-nine thousand, nine hundred ninety-nine".