21133297 has 4 divisors (see below), whose sum is σ = 22052160. Its totient is φ = 20214436.

The previous prime is 21133291. The next prime is 21133303. The reversal of 21133297 is 79233112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (21133291) and next prime (21133303).

It is a cyclic number.

It is not a de Polignac number, because 21133297 - 2¹⁵ = 21100529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21133291) 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, 459397 + ... + 459442.

It is an arithmetic number, because the mean of its divisors is an integer number (5513040).

Almost surely, 2^21133297 is an apocalyptic number.

It is an amenable number.

21133297 is a deficient number, since it is larger than the sum of its proper divisors (918863).

21133297 is an equidigital number, since it uses as much as digits as its factorization.

21133297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918862.

The product of its digits is 2268, while the sum is 28.

The square root of 21133297 is about 4597.0965837146. The cubic root of 21133297 is about 276.4749270669.

The spelling of 21133297 in words is "twenty-one million, one hundred thirty-three thousand, two hundred ninety-seven".