21744974 has 16 divisors (see below), whose sum is σ = 33624528. Its totient is φ = 10539072.

The previous prime is 21744967. The next prime is 21744979. The reversal of 21744974 is 47944712.

21744974 is nontrivially palindromic in base 13.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21744979) 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, 33497 + ... + 34139.

It is an arithmetic number, because the mean of its divisors is an integer number (2101533).

Almost surely, 2^21744974 is an apocalyptic number.

21744974 is a deficient number, since it is larger than the sum of its proper divisors (11879554).

21744974 is a wasteful number, since it uses less digits than its factorization.

21744974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139.

The product of its digits is 56448, while the sum is 38.

The square root of 21744974 is about 4663.1506516517. The cubic root of 21744974 is about 279.1170057749.

The spelling of 21744974 in words is "twenty-one million, seven hundred forty-four thousand, nine hundred seventy-four".