21996319 has 4 divisors (see below), whose sum is σ = 23154040. Its totient is φ = 20838600.

The previous prime is 21996277. The next prime is 21996323. The reversal of 21996319 is 91369912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21996319 is a prime.

It is a super-2 number, since 2×21996319² = 967676099099522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21993319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 578832 + ... + 578869.

It is an arithmetic number, because the mean of its divisors is an integer number (5788510).

Almost surely, 2^21996319 is an apocalyptic number.

21996319 is a deficient number, since it is larger than the sum of its proper divisors (1157721).

21996319 is a wasteful number, since it uses less digits than its factorization.

21996319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157720.

The product of its digits is 26244, while the sum is 40.

The square root of 21996319 is about 4690.0233474899. The cubic root of 21996319 is about 280.1883044563.

The spelling of 21996319 in words is "twenty-one million, nine hundred ninety-six thousand, three hundred nineteen".