21255122327 has 2 divisors, whose sum is σ = 21255122328. Its totient is φ = 21255122326.

The previous prime is 21255122323. The next prime is 21255122417. The reversal of 21255122327 is 72322155212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21255122327 - 2² = 21255122323 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21255122293 and 21255122302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21255122323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10627561163 + 10627561164.

It is an arithmetic number, because the mean of its divisors is an integer number (10627561164).

Almost surely, 2^21255122327 is an apocalyptic number.

21255122327 is a deficient number, since it is larger than the sum of its proper divisors (1).

21255122327 is an equidigital number, since it uses as much as digits as its factorization.

21255122327 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 32.

Adding to 21255122327 its reverse (72322155212), we get a palindrome (93577277539).

The spelling of 21255122327 in words is "twenty-one billion, two hundred fifty-five million, one hundred twenty-two thousand, three hundred twenty-seven".