21284414 has 16 divisors (see below), whose sum is σ = 33133056. Its totient is φ = 10243800.

The previous prime is 21284411. The next prime is 21284423. The reversal of 21284414 is 41448212.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21284411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12269 + ... + 13895.

It is an arithmetic number, because the mean of its divisors is an integer number (2070816).

Almost surely, 2^21284414 is an apocalyptic number.

21284414 is a deficient number, since it is larger than the sum of its proper divisors (11848642).

21284414 is a wasteful number, since it uses less digits than its factorization.

21284414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1871.

The product of its digits is 2048, while the sum is 26.

The square root of 21284414 is about 4613.5034409871. The cubic root of 21284414 is about 277.1323551735.

The spelling of 21284414 in words is "twenty-one million, two hundred eighty-four thousand, four hundred fourteen".