21744662 has 4 divisors (see below), whose sum is σ = 32616996. Its totient is φ = 10872330.

The previous prime is 21744631. The next prime is 21744727. The reversal of 21744662 is 26644712.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5436164 + ... + 5436167.

It is an arithmetic number, because the mean of its divisors is an integer number (8154249).

Almost surely, 2^21744662 is an apocalyptic number.

21744662 is a deficient number, since it is larger than the sum of its proper divisors (10872334).

21744662 is a wasteful number, since it uses less digits than its factorization.

21744662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10872333.

The product of its digits is 16128, while the sum is 32.

The square root of 21744662 is about 4663.1171977552. The cubic root of 21744662 is about 279.1156708316.

The spelling of 21744662 in words is "twenty-one million, seven hundred forty-four thousand, six hundred sixty-two".