21264436331 has 2 divisors, whose sum is σ = 21264436332. Its totient is φ = 21264436330.

The previous prime is 21264436327. The next prime is 21264436351. The reversal of 21264436331 is 13363446212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21264436331 - 2² = 21264436327 is a prime.

It is a super-2 number, since 2×21264436331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21264436291 and 21264436300.

It is not a weakly prime, because it can be changed into another prime (21264436301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10632218165 + 10632218166.

It is an arithmetic number, because the mean of its divisors is an integer number (10632218166).

Almost surely, 2^21264436331 is an apocalyptic number.

21264436331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21264436331 is an equidigital number, since it uses as much as digits as its factorization.

21264436331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 35.

The spelling of 21264436331 in words is "twenty-one billion, two hundred sixty-four million, four hundred thirty-six thousand, three hundred thirty-one".