21920199 has 24 divisors (see below), whose sum is σ = 34837488. Its totient is φ = 12216960.

The previous prime is 21920179. The next prime is 21920203. The reversal of 21920199 is 99102912.

It is not a de Polignac number, because 21920199 - 2¹⁷ = 21789127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21920179) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4209 + ... + 7845.

It is an arithmetic number, because the mean of its divisors is an integer number (1451562).

Almost surely, 2^21920199 is an apocalyptic number.

21920199 is a deficient number, since it is larger than the sum of its proper divisors (12917289).

21920199 is a wasteful number, since it uses less digits than its factorization.

21920199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3695 (or 3688 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 21920199 is about 4681.9012163864. The cubic root of 21920199 is about 279.8647263237.

The spelling of 21920199 in words is "twenty-one million, nine hundred twenty thousand, one hundred ninety-nine".