21314597 has 4 divisors (see below), whose sum is σ = 21470316. Its totient is φ = 21158880.

The previous prime is 21314569. The next prime is 21314603. The reversal of 21314597 is 79541312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16434916 + 4879681 = 4054^2 + 2209^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21314597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21314567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77654 + ... + 77927.

It is an arithmetic number, because the mean of its divisors is an integer number (5367579).

Almost surely, 2^21314597 is an apocalyptic number.

It is an amenable number.

21314597 is a deficient number, since it is larger than the sum of its proper divisors (155719).

21314597 is a wasteful number, since it uses less digits than its factorization.

21314597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155718.

The product of its digits is 7560, while the sum is 32.

The square root of 21314597 is about 4616.7734404019. The cubic root of 21314597 is about 277.2632919089.

The spelling of 21314597 in words is "twenty-one million, three hundred fourteen thousand, five hundred ninety-seven".