21921207068599 has 4 divisors (see below), whose sum is σ = 22455870655680. Its totient is φ = 21386543481520.

The previous prime is 21921207068591. The next prime is 21921207068611. The reversal of 21921207068599 is 99586070212912.

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 21921207068599 - 2³ = 21921207068591 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 (21921207068591) 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, 267331793479 + ... + 267331793560.

It is an arithmetic number, because the mean of its divisors is an integer number (5613967663920).

Almost surely, 2^{21921207068599} is an apocalyptic number.

21921207068599 is a deficient number, since it is larger than the sum of its proper divisors (534663587081).

21921207068599 is an equidigital number, since it uses as much as digits as its factorization.

21921207068599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534663587080.

The product of its (nonzero) digits is 9797760, while the sum is 61.

The spelling of 21921207068599 in words is "twenty-one trillion, nine hundred twenty-one billion, two hundred seven million, sixty-eight thousand, five hundred ninety-nine".