21752642 has 8 divisors (see below), whose sum is σ = 32671632. Its totient is φ = 10862100.

The previous prime is 21752611. The next prime is 21752657. The reversal of 21752642 is 24625712.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5084 + ... + 8327.

It is an arithmetic number, because the mean of its divisors is an integer number (4083954).

Almost surely, 2^21752642 is an apocalyptic number.

21752642 is a deficient number, since it is larger than the sum of its proper divisors (10918990).

21752642 is a wasteful number, since it uses less digits than its factorization.

21752642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14224.

The product of its digits is 6720, while the sum is 29.

The square root of 21752642 is about 4663.9727700749. The cubic root of 21752642 is about 279.1498105612.

The spelling of 21752642 in words is "twenty-one million, seven hundred fifty-two thousand, six hundred forty-two".