21230099 has 16 divisors (see below), whose sum is σ = 23750496. Its totient is φ = 18816000.

The previous prime is 21230047. The next prime is 21230123. The reversal of 21230099 is 99003212.

It is a cyclic number.

It is not a de Polignac number, because 21230099 - 2²⁰ = 20181523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21230299) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107669 + ... + 107865.

It is an arithmetic number, because the mean of its divisors is an integer number (1484406).

Almost surely, 2^21230099 is an apocalyptic number.

21230099 is a deficient number, since it is larger than the sum of its proper divisors (2520397).

21230099 is a wasteful number, since it uses less digits than its factorization.

21230099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 21230099 is about 4607.6131565052. The cubic root of 21230099 is about 276.8964193693.

The spelling of 21230099 in words is "twenty-one million, two hundred thirty thousand, ninety-nine".