21734274 has 8 divisors (see below), whose sum is σ = 43468560. Its totient is φ = 7244756.

The previous prime is 21734269. The next prime is 21734303. The reversal of 21734274 is 47243712.

It is a sphenic number, since it is the product of 3 distinct primes.

21734274 is an admirable number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1811184 + ... + 1811195.

It is an arithmetic number, because the mean of its divisors is an integer number (5433570).

Almost surely, 2^21734274 is an apocalyptic number.

21734274 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21734274 is a wasteful number, since it uses less digits than its factorization.

21734274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3622384.

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

The square root of 21734274 is about 4662.0032175021. The cubic root of 21734274 is about 279.0712167732.

Subtracting from 21734274 its sum of digits (30), we obtain a square (21734244 = 4662²).

Adding to 21734274 its reverse (47243712), we get a palindrome (68977986).

The spelling of 21734274 in words is "twenty-one million, seven hundred thirty-four thousand, two hundred seventy-four".