21256102327 has 2 divisors, whose sum is σ = 21256102328. Its totient is φ = 21256102326.

The previous prime is 21256102321. The next prime is 21256102367. The reversal of 21256102327 is 72320165212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21256102327 - 2³ = 21256102319 is a prime.

It is a super-2 number, since 2×21256102327² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21256102321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10628051163 + 10628051164.

It is an arithmetic number, because the mean of its divisors is an integer number (10628051164).

Almost surely, 2^21256102327 is an apocalyptic number.

21256102327 is a deficient number, since it is larger than the sum of its proper divisors (1).

21256102327 is an equidigital number, since it uses as much as digits as its factorization.

21256102327 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

Adding to 21256102327 its reverse (72320165212), we get a palindrome (93576267539).

The spelling of 21256102327 in words is "twenty-one billion, two hundred fifty-six million, one hundred two thousand, three hundred twenty-seven".