21455575427199 has 4 divisors (see below), whose sum is σ = 28607433902936. Its totient is φ = 14303716951464.

The previous prime is 21455575427177. The next prime is 21455575427227. The reversal of 21455575427199 is 99172457555412.

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

It is not a de Polignac number, because 21455575427199 - 2¹⁹ = 21455574902911 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 (21455575427999) 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, 3575929237864 + ... + 3575929237869.

It is an arithmetic number, because the mean of its divisors is an integer number (7151858475734).

Almost surely, 2^{21455575427199} is an apocalyptic number.

21455575427199 is a deficient number, since it is larger than the sum of its proper divisors (7151858475737).

21455575427199 is an equidigital number, since it uses as much as digits as its factorization.

21455575427199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7151858475736.

The product of its digits is 158760000, while the sum is 66.

The spelling of 21455575427199 in words is "twenty-one trillion, four hundred fifty-five billion, five hundred seventy-five million, four hundred twenty-seven thousand, one hundred ninety-nine".