21974453 has 8 divisors (see below), whose sum is σ = 22984128. Its totient is φ = 20969344.

The previous prime is 21974441. The next prime is 21974461. The reversal of 21974453 is 35447912.

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 21974453 - 2⁴ = 21974437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21974413) 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, 12101 + ... + 13797.

It is an arithmetic number, because the mean of its divisors is an integer number (2873016).

Almost surely, 2^21974453 is an apocalyptic number.

21974453 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21974453 is a deficient number, since it is larger than the sum of its proper divisors (1009675).

21974453 is a wasteful number, since it uses less digits than its factorization.

21974453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2283.

The product of its digits is 30240, while the sum is 35.

The square root of 21974453 is about 4687.6916494155. The cubic root of 21974453 is about 280.0954309065.

The spelling of 21974453 in words is "twenty-one million, nine hundred seventy-four thousand, four hundred fifty-three".