21754606 has 4 divisors (see below), whose sum is σ = 32631912. Its totient is φ = 10877302.

The previous prime is 21754597. The next prime is 21754609. The reversal of 21754606 is 60645712.

It is a happy number.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21754609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5438650 + ... + 5438653.

It is an arithmetic number, because the mean of its divisors is an integer number (8157978).

Almost surely, 2^21754606 is an apocalyptic number.

21754606 is a deficient number, since it is larger than the sum of its proper divisors (10877306).

21754606 is a wasteful number, since it uses less digits than its factorization.

21754606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10877305.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 21754606 is about 4664.1833154369. The cubic root of 21754606 is about 279.1582115902.

The spelling of 21754606 in words is "twenty-one million, seven hundred fifty-four thousand, six hundred six".