21457346 has 8 divisors (see below), whose sum is σ = 33880080. Its totient is φ = 10163988.

The previous prime is 21457339. The next prime is 21457379. The reversal of 21457346 is 64375412.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282296 + ... + 282371.

It is an arithmetic number, because the mean of its divisors is an integer number (4235010).

Almost surely, 2^21457346 is an apocalyptic number.

21457346 is a deficient number, since it is larger than the sum of its proper divisors (12422734).

21457346 is a wasteful number, since it uses less digits than its factorization.

21457346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564688.

The product of its digits is 20160, while the sum is 32.

The square root of 21457346 is about 4632.2074651293. The cubic root of 21457346 is about 277.8808816310.

The spelling of 21457346 in words is "twenty-one million, four hundred fifty-seven thousand, three hundred forty-six".