21754274 has 16 divisors (see below), whose sum is σ = 34696512. Its totient is φ = 10206768.

The previous prime is 21754207. The next prime is 21754283. The reversal of 21754274 is 47245712.

It is a self number, because there is not a number n which added to its sum of digits gives 21754274.

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 7 ways as a sum of consecutive naturals, for example, 2024 + ... + 6899.

It is an arithmetic number, because the mean of its divisors is an integer number (2168532).

Almost surely, 2^21754274 is an apocalyptic number.

21754274 is a deficient number, since it is larger than the sum of its proper divisors (12942238).

21754274 is a wasteful number, since it uses less digits than its factorization.

21754274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9001.

The product of its digits is 15680, while the sum is 32.

The square root of 21754274 is about 4664.1477249332. The cubic root of 21754274 is about 279.1567914925.

Adding to 21754274 its reverse (47245712), we get a palindrome (68999986).

The spelling of 21754274 in words is "twenty-one million, seven hundred fifty-four thousand, two hundred seventy-four".