21252318823 has 2 divisors, whose sum is σ = 21252318824. Its totient is φ = 21252318822.

The previous prime is 21252318821. The next prime is 21252318929. The reversal of 21252318823 is 32881325212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21252318823 - 2¹ = 21252318821 is a prime.

It is a super-2 number, since 2×21252318823² (a number of 21 digits) contains 22 as substring.

Together with 21252318821, 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 (21252318821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10626159411 + 10626159412.

It is an arithmetic number, because the mean of its divisors is an integer number (10626159412).

Almost surely, 2^21252318823 is an apocalyptic number.

21252318823 is a deficient number, since it is larger than the sum of its proper divisors (1).

21252318823 is an equidigital number, since it uses as much as digits as its factorization.

21252318823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 37.

The spelling of 21252318823 in words is "twenty-one billion, two hundred fifty-two million, three hundred eighteen thousand, eight hundred twenty-three".