21386925379 has 2 divisors, whose sum is σ = 21386925380. Its totient is φ = 21386925378.

The previous prime is 21386925341. The next prime is 21386925397. The reversal of 21386925379 is 97352968312.

Together with next prime (21386925397) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21386925379 - 2¹¹ = 21386923331 is a prime.

It is not a weakly prime, because it can be changed into another prime (21386925479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10693462689 + 10693462690.

It is an arithmetic number, because the mean of its divisors is an integer number (10693462690).

Almost surely, 2^21386925379 is an apocalyptic number.

21386925379 is a deficient number, since it is larger than the sum of its proper divisors (1).

21386925379 is an equidigital number, since it uses as much as digits as its factorization.

21386925379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4898880, while the sum is 55.

The spelling of 21386925379 in words is "twenty-one billion, three hundred eighty-six million, nine hundred twenty-five thousand, three hundred seventy-nine".