21032297 has 16 divisors (see below), whose sum is σ = 26013120. Its totient is φ = 16718400.

The previous prime is 21032293. The next prime is 21032299. The reversal of 21032297 is 79223012.

It is a cyclic number.

It is not a de Polignac number, because 21032297 - 2² = 21032293 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21032293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1154 + ... + 6587.

It is an arithmetic number, because the mean of its divisors is an integer number (1625820).

Almost surely, 2^21032297 is an apocalyptic number.

It is an amenable number.

21032297 is a deficient number, since it is larger than the sum of its proper divisors (4980823).

21032297 is a wasteful number, since it uses less digits than its factorization.

21032297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7784.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 21032297 is about 4586.0982327028. The cubic root of 21032297 is about 276.0337816593.

The spelling of 21032297 in words is "twenty-one million, thirty-two thousand, two hundred ninety-seven".