21470097 has 8 divisors (see below), whose sum is σ = 31229280. Its totient is φ = 13012160.

The previous prime is 21470081. The next prime is 21470123. The reversal of 21470097 is 79007412.

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 21470097 - 2⁴ = 21470081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21470047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325272 + ... + 325337.

It is an arithmetic number, because the mean of its divisors is an integer number (3903660).

Almost surely, 2^21470097 is an apocalyptic number.

It is an amenable number.

21470097 is a deficient number, since it is larger than the sum of its proper divisors (9759183).

21470097 is a wasteful number, since it uses less digits than its factorization.

21470097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650623.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 21470097 is about 4633.5836023536. The cubic root of 21470097 is about 277.9359141825.

The spelling of 21470097 in words is "twenty-one million, four hundred seventy thousand, ninety-seven".