21434774 has 16 divisors (see below), whose sum is σ = 34353600. Its totient is φ = 10000584.

The previous prime is 21434767. The next prime is 21434779. The reversal of 21434774 is 47743412.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21434774.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1664 + ... + 6755.

It is an arithmetic number, because the mean of its divisors is an integer number (2147100).

Almost surely, 2^21434774 is an apocalyptic number.

21434774 is a deficient number, since it is larger than the sum of its proper divisors (12918826).

21434774 is a wasteful number, since it uses less digits than its factorization.

21434774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8507.

The product of its digits is 18816, while the sum is 32.

The square root of 21434774 is about 4629.7704046745. The cubic root of 21434774 is about 277.7834087510.

The spelling of 21434774 in words is "twenty-one million, four hundred thirty-four thousand, seven hundred seventy-four".