21119997 has 8 divisors (see below), whose sum is σ = 28265760. Its totient is φ = 14027120.

The previous prime is 21119953. The next prime is 21119999. The reversal of 21119997 is 79991112.

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 21119997 - 2⁷ = 21119869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21119999) 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, 12279 + ... + 13892.

It is an arithmetic number, because the mean of its divisors is an integer number (3533220).

Almost surely, 2^21119997 is an apocalyptic number.

It is an amenable number.

21119997 is a deficient number, since it is larger than the sum of its proper divisors (7145763).

21119997 is a wasteful number, since it uses less digits than its factorization.

21119997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26443.

The product of its digits is 10206, while the sum is 39.

The square root of 21119997 is about 4595.6497908348. The cubic root of 21119997 is about 276.4169161125.

The spelling of 21119997 in words is "twenty-one million, one hundred nineteen thousand, nine hundred ninety-seven".