21252297 has 8 divisors (see below), whose sum is σ = 30912480. Its totient is φ = 12880160.

The previous prime is 21252293. The next prime is 21252323. The reversal of 21252297 is 79225212.

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 21252297 - 2² = 21252293 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21252293) 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, 321972 + ... + 322037.

It is an arithmetic number, because the mean of its divisors is an integer number (3864060).

Almost surely, 2^21252297 is an apocalyptic number.

It is an amenable number.

21252297 is a deficient number, since it is larger than the sum of its proper divisors (9660183).

21252297 is a wasteful number, since it uses less digits than its factorization.

21252297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644023.

The product of its digits is 5040, while the sum is 30.

The square root of 21252297 is about 4610.0213665448. The cubic root of 21252297 is about 276.9928925527.

The spelling of 21252297 in words is "twenty-one million, two hundred fifty-two thousand, two hundred ninety-seven".