21210199 has 8 divisors (see below), whose sum is σ = 21450240. Its totient is φ = 20971896.

The previous prime is 21210197. The next prime is 21210221. The reversal of 21210199 is 99101212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21210199 - 2¹ = 21210197 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 (21210193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50412 + ... + 50830.

It is an arithmetic number, because the mean of its divisors is an integer number (2681280).

Almost surely, 2^21210199 is an apocalyptic number.

21210199 is a deficient number, since it is larger than the sum of its proper divisors (240041).

21210199 is a wasteful number, since it uses less digits than its factorization.

21210199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 21210199 is about 4605.4531807413. The cubic root of 21210199 is about 276.8098761818.

The spelling of 21210199 in words is "twenty-one million, two hundred ten thousand, one hundred ninety-nine".