21674814 has 48 divisors (see below), whose sum is σ = 50945664. Its totient is φ = 6022080.

The previous prime is 21674791. The next prime is 21674819. The reversal of 21674814 is 41847612.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21674819) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70449 + ... + 70755.

It is an arithmetic number, because the mean of its divisors is an integer number (1061368).

Almost surely, 2^21674814 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21674814, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25472832).

21674814 is an abundant number, since it is smaller than the sum of its proper divisors (29270850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21674814 is a wasteful number, since it uses less digits than its factorization.

21674814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401 (or 360 counting only the distinct ones).

The product of its digits is 10752, while the sum is 33.

The square root of 21674814 is about 4655.6217629872. The cubic root of 21674814 is about 278.8164926806.

The spelling of 21674814 in words is "twenty-one million, six hundred seventy-four thousand, eight hundred fourteen".