21748354 has 8 divisors (see below), whose sum is σ = 32690448. Its totient is φ = 10851540.

The previous prime is 21748351. The next prime is 21748361. The reversal of 21748354 is 45384712.

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

It is not an unprimeable number, because it can be changed into a prime (21748351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10092 + ... + 12055.

It is an arithmetic number, because the mean of its divisors is an integer number (4086306).

Almost surely, 2^21748354 is an apocalyptic number.

21748354 is a deficient number, since it is larger than the sum of its proper divisors (10942094).

21748354 is a wasteful number, since it uses less digits than its factorization.

21748354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22640.

The product of its digits is 26880, while the sum is 34.

The square root of 21748354 is about 4663.5130534823. The cubic root of 21748354 is about 279.1314668423.

The spelling of 21748354 in words is "twenty-one million, seven hundred forty-eight thousand, three hundred fifty-four".