21103299 has 12 divisors (see below), whose sum is σ = 34837296. Its totient is φ = 12058992.

The previous prime is 21103267. The next prime is 21103301. The reversal of 21103299 is 99230112.

It is not a de Polignac number, because 21103299 - 2⁵ = 21103267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21103249) 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, 167424 + ... + 167549.

It is an arithmetic number, because the mean of its divisors is an integer number (2903108).

Almost surely, 2^21103299 is an apocalyptic number.

21103299 is a deficient number, since it is larger than the sum of its proper divisors (13733997).

21103299 is a wasteful number, since it uses less digits than its factorization.

21103299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334986 (or 334983 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 21103299 is about 4593.8327135411. The cubic root of 21103299 is about 276.3440495206.

The spelling of 21103299 in words is "twenty-one million, one hundred three thousand, two hundred ninety-nine".