21264436327 has 2 divisors, whose sum is σ = 21264436328. Its totient is φ = 21264436326.

The previous prime is 21264436301. The next prime is 21264436331. The reversal of 21264436327 is 72363446212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21264436327 - 2¹⁹ = 21263912039 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21264436327.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21264446327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10632218163 + 10632218164.

It is an arithmetic number, because the mean of its divisors is an integer number (10632218164).

Almost surely, 2^21264436327 is an apocalyptic number.

21264436327 is a deficient number, since it is larger than the sum of its proper divisors (1).

21264436327 is an equidigital number, since it uses as much as digits as its factorization.

21264436327 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 40.

The spelling of 21264436327 in words is "twenty-one billion, two hundred sixty-four million, four hundred thirty-six thousand, three hundred twenty-seven".