21274897 has 8 divisors (see below), whose sum is σ = 25098752. Its totient is φ = 17647200.

The previous prime is 21274873. The next prime is 21274907. The reversal of 21274897 is 79847212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21274897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21274817) 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, 48804 + ... + 49237.

It is an arithmetic number, because the mean of its divisors is an integer number (3137344).

Almost surely, 2^21274897 is an apocalyptic number.

It is an amenable number.

21274897 is a deficient number, since it is larger than the sum of its proper divisors (3823855).

21274897 is an equidigital number, since it uses as much as digits as its factorization.

21274897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98079.

The product of its digits is 56448, while the sum is 40.

The square root of 21274897 is about 4612.4718969334. The cubic root of 21274897 is about 277.0910438517.

The spelling of 21274897 in words is "twenty-one million, two hundred seventy-four thousand, eight hundred ninety-seven".