21674890 has 32 divisors (see below), whose sum is σ = 41679360. Its totient is φ = 8097600.

The previous prime is 21674857. The next prime is 21674899. The reversal of 21674890 is 9847612.

It is not an unprimeable number, because it can be changed into a prime (21674899) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 7785 + ... + 10195.

It is an arithmetic number, because the mean of its divisors is an integer number (1302480).

Almost surely, 2^21674890 is an apocalyptic number.

21674890 is a deficient number, since it is larger than the sum of its proper divisors (20004470).

21674890 is a wasteful number, since it uses less digits than its factorization.

21674890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2478.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 21674890 is about 4655.6299251551. The cubic root of 21674890 is about 278.8168185585.

The spelling of 21674890 in words is "twenty-one million, six hundred seventy-four thousand, eight hundred ninety".