21123576379 has 2 divisors, whose sum is σ = 21123576380. Its totient is φ = 21123576378.

The previous prime is 21123576337. The next prime is 21123576433. The reversal of 21123576379 is 97367532112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21123576379 - 2⁷ = 21123576251 is a prime.

It is not a weakly prime, because it can be changed into another prime (21123576319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561788189 + 10561788190.

It is an arithmetic number, because the mean of its divisors is an integer number (10561788190).

Almost surely, 2^21123576379 is an apocalyptic number.

21123576379 is a deficient number, since it is larger than the sum of its proper divisors (1).

21123576379 is an equidigital number, since it uses as much as digits as its factorization.

21123576379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476280, while the sum is 46.

The spelling of 21123576379 in words is "twenty-one billion, one hundred twenty-three million, five hundred seventy-six thousand, three hundred seventy-nine".