21919353 has 8 divisors (see below), whose sum is σ = 29253216. Its totient is φ = 14599200.

The previous prime is 21919349. The next prime is 21919357. The reversal of 21919353 is 35391912.

It is an interprime number because it is at equal distance from previous prime (21919349) and next prime (21919357).

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

It is not a de Polignac number, because 21919353 - 2² = 21919349 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21919357) 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, 1198 + ... + 6728.

It is an arithmetic number, because the mean of its divisors is an integer number (3656652).

Almost surely, 2^21919353 is an apocalyptic number.

It is an amenable number.

21919353 is a deficient number, since it is larger than the sum of its proper divisors (7333863).

21919353 is a wasteful number, since it uses less digits than its factorization.

21919353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6855.

The product of its digits is 7290, while the sum is 33.

The square root of 21919353 is about 4681.8108676024. The cubic root of 21919353 is about 279.8611258606.

The spelling of 21919353 in words is "twenty-one million, nine hundred nineteen thousand, three hundred fifty-three".