21046199 has 4 divisors (see below), whose sum is σ = 21771960. Its totient is φ = 20320440.

The previous prime is 21046171. The next prime is 21046217. The reversal of 21046199 is 99164012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21046199 - 2¹² = 21042103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21046139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362837 + ... + 362894.

It is an arithmetic number, because the mean of its divisors is an integer number (5442990).

Almost surely, 2^21046199 is an apocalyptic number.

21046199 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21046199 is a deficient number, since it is larger than the sum of its proper divisors (725761).

21046199 is an equidigital number, since it uses as much as digits as its factorization.

21046199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725760.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 21046199 is about 4587.6136498184. The cubic root of 21046199 is about 276.0945861838.

The spelling of 21046199 in words is "twenty-one million, forty-six thousand, one hundred ninety-nine".