21112299 has 16 divisors (see below), whose sum is σ = 33684000. Its totient is φ = 12991968.

The previous prime is 21112291. The next prime is 21112339. The reversal of 21112299 is 99221112.

It is not a de Polignac number, because 21112299 - 2³ = 21112291 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21112291) 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, 29724 + ... + 30425.

It is an arithmetic number, because the mean of its divisors is an integer number (2105250).

Almost surely, 2^21112299 is an apocalyptic number.

21112299 is a deficient number, since it is larger than the sum of its proper divisors (12571701).

21112299 is a wasteful number, since it uses less digits than its factorization.

21112299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60171 (or 60165 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 21112299 is about 4594.8121833215. The cubic root of 21112299 is about 276.3833284184.

The spelling of 21112299 in words is "twenty-one million, one hundred twelve thousand, two hundred ninety-nine".