21093642378719 has 2 divisors, whose sum is σ = 21093642378720. Its totient is φ = 21093642378718.

The previous prime is 21093642378689. The next prime is 21093642378751. The reversal of 21093642378719 is 91787324639012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21093642378719 - 2⁸ = 21093642378463 is a prime.

It is a super-2 number, since 2×21093642378719² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21093642378779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10546821189359 + 10546821189360.

It is an arithmetic number, because the mean of its divisors is an integer number (10546821189360).

Almost surely, 2^{21093642378719} is an apocalyptic number.

21093642378719 is a deficient number, since it is larger than the sum of its proper divisors (1).

21093642378719 is an equidigital number, since it uses as much as digits as its factorization.

21093642378719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27433728, while the sum is 62.

The spelling of 21093642378719 in words is "twenty-one trillion, ninety-three billion, six hundred forty-two million, three hundred seventy-eight thousand, seven hundred nineteen".