21900319 has 8 divisors (see below), whose sum is σ = 25310880. Its totient is φ = 18560256.

The previous prime is 21900313. The next prime is 21900341. The reversal of 21900319 is 91300912.

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 21900319 - 2¹¹ = 21898271 is a prime.

It is a super-2 number, since 2×21900319² = 959247944603522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21900293 and 21900302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21900313) 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, 16954 + ... + 18199.

It is an arithmetic number, because the mean of its divisors is an integer number (3163860).

Almost surely, 2^21900319 is an apocalyptic number.

21900319 is a deficient number, since it is larger than the sum of its proper divisors (3410561).

21900319 is an equidigital number, since it uses as much as digits as its factorization.

21900319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35249.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 21900319 is about 4679.7776656589. Note that the first 3 decimals coincide. The cubic root of 21900319 is about 279.7800951948.

The spelling of 21900319 in words is "twenty-one million, nine hundred thousand, three hundred nineteen".