21010199 has 8 divisors (see below), whose sum is σ = 24236928. Its totient is φ = 17839800.

The previous prime is 21010193. The next prime is 21010217. The reversal of 21010199 is 99101012.

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 21010199 - 2¹² = 21006103 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 (21010193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13277 + ... + 14774.

It is an arithmetic number, because the mean of its divisors is an integer number (3029616).

Almost surely, 2^21010199 is an apocalyptic number.

21010199 is a deficient number, since it is larger than the sum of its proper divisors (3226729).

21010199 is a wasteful number, since it uses less digits than its factorization.

21010199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28165.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 21010199 is about 4583.6883620072. The cubic root of 21010199 is about 275.9370743264.

The spelling of 21010199 in words is "twenty-one million, ten thousand, one hundred ninety-nine".