21072866192399 has 4 divisors (see below), whose sum is σ = 24083275648464. Its totient is φ = 18062456736336.

The previous prime is 21072866192381. The next prime is 21072866192449. The reversal of 21072866192399 is 99329166827012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21072866192399 - 2⁸ = 21072866192143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21072866198399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1505204728022 + ... + 1505204728035.

It is an arithmetic number, because the mean of its divisors is an integer number (6020818912116).

Almost surely, 2^{21072866192399} is an apocalyptic number.

21072866192399 is a deficient number, since it is larger than the sum of its proper divisors (3010409456065).

21072866192399 is an equidigital number, since it uses as much as digits as its factorization.

21072866192399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3010409456064.

The product of its (nonzero) digits is 35271936, while the sum is 65.

The spelling of 21072866192399 in words is "twenty-one trillion, seventy-two billion, eight hundred sixty-six million, one hundred ninety-two thousand, three hundred ninety-nine".