21913380788711 has 2 divisors, whose sum is σ = 21913380788712. Its totient is φ = 21913380788710.

The previous prime is 21913380788531. The next prime is 21913380788731. The reversal of 21913380788711 is 11788708331912.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21913380788711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21913380788731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10956690394355 + 10956690394356.

It is an arithmetic number, because the mean of its divisors is an integer number (10956690394356).

Almost surely, 2^{21913380788711} is an apocalyptic number.

21913380788711 is a deficient number, since it is larger than the sum of its proper divisors (1).

21913380788711 is an equidigital number, since it uses as much as digits as its factorization.

21913380788711 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4064256, while the sum is 59.

The spelling of 21913380788711 in words is "twenty-one trillion, nine hundred thirteen billion, three hundred eighty million, seven hundred eighty-eight thousand, seven hundred eleven".