21714397 has 4 divisors (see below), whose sum is σ = 22857280. Its totient is φ = 20571516.

The previous prime is 21714391. The next prime is 21714401. The reversal of 21714397 is 79341712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21714397 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 (21714391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 571413 + ... + 571450.

It is an arithmetic number, because the mean of its divisors is an integer number (5714320).

Almost surely, 2^21714397 is an apocalyptic number.

It is an amenable number.

21714397 is a deficient number, since it is larger than the sum of its proper divisors (1142883).

21714397 is a wasteful number, since it uses less digits than its factorization.

21714397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142882.

The product of its digits is 10584, while the sum is 34.

The square root of 21714397 is about 4659.8709209591. The cubic root of 21714397 is about 278.9861163083.

The spelling of 21714397 in words is "twenty-one million, seven hundred fourteen thousand, three hundred ninety-seven".