21159099 has 12 divisors (see below), whose sum is σ = 32914336. Its totient is φ = 13020912.

The previous prime is 21159091. The next prime is 21159109. The reversal of 21159099 is 99095112.

It is not a de Polignac number, because 21159099 - 2³ = 21159091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21159091) 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, 90307 + ... + 90540.

Almost surely, 2^21159099 is an apocalyptic number.

21159099 is a deficient number, since it is larger than the sum of its proper divisors (11755237).

21159099 is a wasteful number, since it uses less digits than its factorization.

21159099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180866 (or 180863 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 36.

The square root of 21159099 is about 4599.9020641748. The cubic root of 21159099 is about 276.5873989457.

The spelling of 21159099 in words is "twenty-one million, one hundred fifty-nine thousand, ninety-nine".