21728010239999 has 16 divisors (see below), whose sum is σ = 25897302552576. Its totient is φ = 17837427744000.

The previous prime is 21728010239983. The next prime is 21728010240007. The reversal of 21728010239999 is 99993201082712.

It is a cyclic number.

It is not a de Polignac number, because 21728010239999 - 2⁴ = 21728010239983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21728010239939) 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, 516108227 + ... + 516150324.

It is an arithmetic number, because the mean of its divisors is an integer number (1618581409536).

Almost surely, 2^{21728010239999} is an apocalyptic number.

21728010239999 is a deficient number, since it is larger than the sum of its proper divisors (4169292312577).

21728010239999 is a wasteful number, since it uses less digits than its factorization.

21728010239999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032258686.

The product of its (nonzero) digits is 8817984, while the sum is 62.

The spelling of 21728010239999 in words is "twenty-one trillion, seven hundred twenty-eight billion, ten million, two hundred thirty-nine thousand, nine hundred ninety-nine".