21426774 has 16 divisors (see below), whose sum is σ = 44012208. Its totient is φ = 6949152.

The previous prime is 21426773. The next prime is 21426793. The reversal of 21426774 is 47762412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21426773) 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 7 ways as a sum of consecutive naturals, for example, 48037 + ... + 48480.

It is an arithmetic number, because the mean of its divisors is an integer number (2750763).

Almost surely, 2^21426774 is an apocalyptic number.

21426774 is an abundant number, since it is smaller than the sum of its proper divisors (22585434).

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

21426774 is a wasteful number, since it uses less digits than its factorization.

21426774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96559.

The product of its digits is 18816, while the sum is 33.

The square root of 21426774 is about 4628.9063503165. The cubic root of 21426774 is about 277.7488458519.

The spelling of 21426774 in words is "twenty-one million, four hundred twenty-six thousand, seven hundred seventy-four".