21836899 has 12 divisors (see below), whose sum is σ = 25478544. Its totient is φ = 18661104.

The previous prime is 21836879. The next prime is 21836917. The reversal of 21836899 is 99863812.

It is not a de Polignac number, because 21836899 - 2¹³ = 21828707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21836809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29674 + ... + 30400.

It is an arithmetic number, because the mean of its divisors is an integer number (2123212).

Almost surely, 2^21836899 is an apocalyptic number.

21836899 is a deficient number, since it is larger than the sum of its proper divisors (3641645).

21836899 is an equidigital number, since it uses as much as digits as its factorization.

21836899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354 (or 1347 counting only the distinct ones).

The product of its digits is 186624, while the sum is 46.

The square root of 21836899 is about 4672.9967900695. The cubic root of 21836899 is about 279.5097671859.

The spelling of 21836899 in words is "twenty-one million, eight hundred thirty-six thousand, eight hundred ninety-nine".