21072916327 has 2 divisors, whose sum is σ = 21072916328. Its totient is φ = 21072916326.

The previous prime is 21072916289. The next prime is 21072916343. The reversal of 21072916327 is 72361927012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21072916327 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21072916327.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21072916387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10536458163 + 10536458164.

It is an arithmetic number, because the mean of its divisors is an integer number (10536458164).

Almost surely, 2^21072916327 is an apocalyptic number.

21072916327 is a deficient number, since it is larger than the sum of its proper divisors (1).

21072916327 is an equidigital number, since it uses as much as digits as its factorization.

21072916327 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 40.

The spelling of 21072916327 in words is "twenty-one billion, seventy-two million, nine hundred sixteen thousand, three hundred twenty-seven".