21752275399 has 2 divisors, whose sum is σ = 21752275400. Its totient is φ = 21752275398.

The previous prime is 21752275397. The next prime is 21752275417. The reversal of 21752275399 is 99357225712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21752275399 - 2¹ = 21752275397 is a prime.

It is a super-2 number, since 2×21752275399² (a number of 21 digits) contains 22 as substring.

Together with 21752275397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21752275397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10876137699 + 10876137700.

It is an arithmetic number, because the mean of its divisors is an integer number (10876137700).

Almost surely, 2^21752275399 is an apocalyptic number.

21752275399 is a deficient number, since it is larger than the sum of its proper divisors (1).

21752275399 is an equidigital number, since it uses as much as digits as its factorization.

21752275399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2381400, while the sum is 52.

The spelling of 21752275399 in words is "twenty-one billion, seven hundred fifty-two million, two hundred seventy-five thousand, three hundred ninety-nine".