21430199 has 6 divisors (see below), whose sum is σ = 24929064. Its totient is φ = 18368700.

The previous prime is 21430193. The next prime is 21430229. The reversal of 21430199 is 99103412.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21430199 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 (21430193) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 218627 + ... + 218724.

It is an arithmetic number, because the mean of its divisors is an integer number (4154844).

Almost surely, 2^21430199 is an apocalyptic number.

21430199 is a deficient number, since it is larger than the sum of its proper divisors (3498865).

21430199 is an equidigital number, since it uses as much as digits as its factorization.

21430199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437365 (or 437358 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 21430199 is about 4629.2762933314. The cubic root of 21430199 is about 277.7636441461.

The spelling of 21430199 in words is "twenty-one million, four hundred thirty thousand, one hundred ninety-nine".