21860099 has 2 divisors, whose sum is σ = 21860100. Its totient is φ = 21860098.

The previous prime is 21860077. The next prime is 21860117. The reversal of 21860099 is 99006812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21860099 - 2⁸ = 21859843 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21865099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10930049 + 10930050.

It is an arithmetic number, because the mean of its divisors is an integer number (10930050).

Almost surely, 2^21860099 is an apocalyptic number.

21860099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21860099 is an equidigital number, since it uses as much as digits as its factorization.

21860099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 21860099 is about 4675.4784781881. The cubic root of 21860099 is about 279.6087179188.

The spelling of 21860099 in words is "twenty-one million, eight hundred sixty thousand, ninety-nine".