21120099 has 48 divisors (see below), whose sum is σ = 38087424. Its totient is φ = 10108800.

The previous prime is 21120089. The next prime is 21120109. The reversal of 21120099 is 99002112.

It is an interprime number because it is at equal distance from previous prime (21120089) and next prime (21120109).

It is not a de Polignac number, because 21120099 - 2⁵ = 21120067 is a prime.

It is a super-3 number, since 3×21120099³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21120019) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38769 + ... + 39309.

It is an arithmetic number, because the mean of its divisors is an integer number (793488).

Almost surely, 2^21120099 is an apocalyptic number.

21120099 is a deficient number, since it is larger than the sum of its proper divisors (16967325).

21120099 is a wasteful number, since it uses less digits than its factorization.

21120099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588 (or 575 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 21120099 is about 4595.6608882728. The cubic root of 21120099 is about 276.4173611012.

The spelling of 21120099 in words is "twenty-one million, one hundred twenty thousand, ninety-nine".