21260199 has 8 divisors (see below), whose sum is σ = 28376560. Its totient is φ = 14158656.

The previous prime is 21260191. The next prime is 21260207. The reversal of 21260199 is 99106212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21260191) and next prime (21260207).

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

It is not a de Polignac number, because 21260199 - 2³ = 21260191 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 (21260191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249 + ... + 6525.

It is an arithmetic number, because the mean of its divisors is an integer number (3547070).

Almost surely, 2^21260199 is an apocalyptic number.

21260199 is a deficient number, since it is larger than the sum of its proper divisors (7116361).

21260199 is a wasteful number, since it uses less digits than its factorization.

21260199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7409.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 21260199 is about 4610.8783328125. The cubic root of 21260199 is about 277.0272186715.

The spelling of 21260199 in words is "twenty-one million, two hundred sixty thousand, one hundred ninety-nine".