21604002319 has 2 divisors, whose sum is σ = 21604002320. Its totient is φ = 21604002318.

The previous prime is 21604002247. The next prime is 21604002323. The reversal of 21604002319 is 91320040612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21604002319 - 2¹³ = 21603994127 is a prime.

It is a super-2 number, since 2×21604002319² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21604002019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10802001159 + 10802001160.

It is an arithmetic number, because the mean of its divisors is an integer number (10802001160).

Almost surely, 2^21604002319 is an apocalyptic number.

21604002319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21604002319 is an equidigital number, since it uses as much as digits as its factorization.

21604002319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 21604002319 in words is "twenty-one billion, six hundred four million, two thousand, three hundred nineteen".