21839107 has 2 divisors, whose sum is σ = 21839108. Its totient is φ = 21839106.

The previous prime is 21839099. The next prime is 21839123. The reversal of 21839107 is 70193812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21839107 - 2³ = 21839099 is a prime.

It is not a weakly prime, because it can be changed into another prime (21839177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10919553 + 10919554.

It is an arithmetic number, because the mean of its divisors is an integer number (10919554).

Almost surely, 2^21839107 is an apocalyptic number.

21839107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21839107 is an equidigital number, since it uses as much as digits as its factorization.

21839107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 21839107 is about 4673.2330350626. The cubic root of 21839107 is about 279.5191875828.

The spelling of 21839107 in words is "twenty-one million, eight hundred thirty-nine thousand, one hundred seven".