21457846 has 4 divisors (see below), whose sum is σ = 32186772. Its totient is φ = 10728922.

The previous prime is 21457841. The next prime is 21457853. The reversal of 21457846 is 64875412.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21457841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5364460 + ... + 5364463.

It is an arithmetic number, because the mean of its divisors is an integer number (8046693).

Almost surely, 2^21457846 is an apocalyptic number.

21457846 is a deficient number, since it is larger than the sum of its proper divisors (10728926).

21457846 is a wasteful number, since it uses less digits than its factorization.

21457846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10728925.

The product of its digits is 53760, while the sum is 37.

The square root of 21457846 is about 4632.2614347638. The cubic root of 21457846 is about 277.8830400117.

The spelling of 21457846 in words is "twenty-one million, four hundred fifty-seven thousand, eight hundred forty-six".