21487846 has 4 divisors (see below), whose sum is σ = 32231772. Its totient is φ = 10743922.

The previous prime is 21487783. The next prime is 21487891. The reversal of 21487846 is 64878412.

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

It is a junction number, because it is equal to n+sod(n) for n = 21487799 and 21487808.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 5371960 + ... + 5371963.

It is an arithmetic number, because the mean of its divisors is an integer number (8057943).

Almost surely, 2^21487846 is an apocalyptic number.

21487846 is a deficient number, since it is larger than the sum of its proper divisors (10743926).

21487846 is a wasteful number, since it uses less digits than its factorization.

21487846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10743925.

The product of its digits is 86016, while the sum is 40.

The square root of 21487846 is about 4635.4984629487. The cubic root of 21487846 is about 278.0124815403.

The spelling of 21487846 in words is "twenty-one million, four hundred eighty-seven thousand, eight hundred forty-six".