21112665504379 has 2 divisors, whose sum is σ = 21112665504380. Its totient is φ = 21112665504378.

The previous prime is 21112665504223. The next prime is 21112665504391. The reversal of 21112665504379 is 97340556621112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112665504379 - 2¹³ = 21112665496187 is a prime.

It is not a weakly prime, because it can be changed into another prime (21112665504179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556332752189 + 10556332752190.

It is an arithmetic number, because the mean of its divisors is an integer number (10556332752190).

Almost surely, 2^{21112665504379} is an apocalyptic number.

21112665504379 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112665504379 is an equidigital number, since it uses as much as digits as its factorization.

21112665504379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2721600, while the sum is 52.

The spelling of 21112665504379 in words is "twenty-one trillion, one hundred twelve billion, six hundred sixty-five million, five hundred four thousand, three hundred seventy-nine".