21886379 has 2 divisors, whose sum is σ = 21886380. Its totient is φ = 21886378.

The previous prime is 21886357. The next prime is 21886391. The reversal of 21886379 is 97368812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21886379 - 2¹² = 21882283 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21886399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10943189 + 10943190.

It is an arithmetic number, because the mean of its divisors is an integer number (10943190).

Almost surely, 2^21886379 is an apocalyptic number.

21886379 is a deficient number, since it is larger than the sum of its proper divisors (1).

21886379 is an equidigital number, since it uses as much as digits as its factorization.

21886379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 44.

The square root of 21886379 is about 4678.2880415810. The cubic root of 21886379 is about 279.7207206818.

The spelling of 21886379 in words is "twenty-one million, eight hundred eighty-six thousand, three hundred seventy-nine".