21974327 has 4 divisors (see below), whose sum is σ = 22045296. Its totient is φ = 21903360.

The previous prime is 21974321. The next prime is 21974357. The reversal of 21974327 is 72347912.

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

It is a cyclic number.

It is not a de Polignac number, because 21974327 - 2¹⁶ = 21908791 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 (21974321) 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, 35018 + ... + 35639.

It is an arithmetic number, because the mean of its divisors is an integer number (5511324).

Almost surely, 2^21974327 is an apocalyptic number.

21974327 is a deficient number, since it is larger than the sum of its proper divisors (70969).

21974327 is an equidigital number, since it uses as much as digits as its factorization.

21974327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70968.

The product of its digits is 21168, while the sum is 35.

The square root of 21974327 is about 4687.6782099457. The cubic root of 21974327 is about 280.0948955561.

The spelling of 21974327 in words is "twenty-one million, nine hundred seventy-four thousand, three hundred twenty-seven".