21663411124379 has 2 divisors, whose sum is σ = 21663411124380. Its totient is φ = 21663411124378.

The previous prime is 21663411124343. The next prime is 21663411124469. The reversal of 21663411124379 is 97342111436612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21663411124379 is a prime.

It is not a weakly prime, because it can be changed into another prime (21663411124279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10831705562189 + 10831705562190.

It is an arithmetic number, because the mean of its divisors is an integer number (10831705562190).

Almost surely, 2^{21663411124379} is an apocalyptic number.

21663411124379 is a deficient number, since it is larger than the sum of its proper divisors (1).

21663411124379 is an equidigital number, since it uses as much as digits as its factorization.

21663411124379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 50.

The spelling of 21663411124379 in words is "twenty-one trillion, six hundred sixty-three billion, four hundred eleven million, one hundred twenty-four thousand, three hundred seventy-nine".