21275327699 has 4 divisors (see below), whose sum is σ = 21302851536. Its totient is φ = 21247803864.

The previous prime is 21275327693. The next prime is 21275327747. The reversal of 21275327699 is 99672357212.

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 21275327699 - 2¹⁶ = 21275262163 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21275327699.

It is not an unprimeable number, because it can be changed into a prime (21275327693) 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, 13760759 + ... + 13762304.

It is an arithmetic number, because the mean of its divisors is an integer number (5325712884).

Almost surely, 2^21275327699 is an apocalyptic number.

21275327699 is a deficient number, since it is larger than the sum of its proper divisors (27523837).

21275327699 is an equidigital number, since it uses as much as digits as its factorization.

21275327699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27523836.

The product of its digits is 2857680, while the sum is 53.

The spelling of 21275327699 in words is "twenty-one billion, two hundred seventy-five million, three hundred twenty-seven thousand, six hundred ninety-nine".