21743274 has 32 divisors (see below), whose sum is σ = 49852800. Its totient is φ = 6193152.

The previous prime is 21743263. The next prime is 21743287. The reversal of 21743274 is 47234712.

It is an unprimeable number.

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, 18282 + ... + 19434.

It is an arithmetic number, because the mean of its divisors is an integer number (1557900).

Almost surely, 2^21743274 is an apocalyptic number.

21743274 is an abundant number, since it is smaller than the sum of its proper divisors (28109526).

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

21743274 is a wasteful number, since it uses less digits than its factorization.

21743274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1614.

The product of its digits is 9408, while the sum is 30.

The square root of 21743274 is about 4662.9683678961. The cubic root of 21743274 is about 279.1097318906.

Adding to 21743274 its reverse (47234712), we get a palindrome (68977986).

The spelling of 21743274 in words is "twenty-one million, seven hundred forty-three thousand, two hundred seventy-four".