21120097 has 8 divisors (see below), whose sum is σ = 21651840. Its totient is φ = 20595120.

The previous prime is 21120089. The next prime is 21120109. The reversal of 21120097 is 79002112.

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 21120097 - 2³ = 21120089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120017) 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, 4947 + ... + 8167.

It is an arithmetic number, because the mean of its divisors is an integer number (2706480).

Almost surely, 2^21120097 is an apocalyptic number.

It is an amenable number.

21120097 is a deficient number, since it is larger than the sum of its proper divisors (531743).

21120097 is an equidigital number, since it uses as much as digits as its factorization.

21120097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3383.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 21120097 is about 4595.6606706762. The cubic root of 21120097 is about 276.4173523760.

The spelling of 21120097 in words is "twenty-one million, one hundred twenty thousand, ninety-seven".