21446986 has 8 divisors (see below), whose sum is σ = 35095104. Its totient is φ = 9748620.

The previous prime is 21446963. The next prime is 21446987. The reversal of 21446986 is 68964412.

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 (21446987) 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, 487410 + ... + 487453.

It is an arithmetic number, because the mean of its divisors is an integer number (4386888).

Almost surely, 2^21446986 is an apocalyptic number.

21446986 is a deficient number, since it is larger than the sum of its proper divisors (13648118).

21446986 is a wasteful number, since it uses less digits than its factorization.

21446986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974876.

The product of its digits is 82944, while the sum is 40.

The square root of 21446986 is about 4631.0890727776. The cubic root of 21446986 is about 277.8361524370.

The spelling of 21446986 in words is "twenty-one million, four hundred forty-six thousand, nine hundred eighty-six".