21730274 has 8 divisors (see below), whose sum is σ = 33129948. Its totient is φ = 10686960.

The previous prime is 21730273. The next prime is 21730277. The reversal of 21730274 is 47203712.

It can be written as a sum of positive squares in 2 ways, for example, as 14478025 + 7252249 = 3805^2 + 2693^2 .

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

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (21730273) 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 3 ways as a sum of consecutive naturals, for example, 88937 + ... + 89180.

Almost surely, 2^21730274 is an apocalyptic number.

21730274 is a deficient number, since it is larger than the sum of its proper divisors (11399674).

21730274 is a wasteful number, since it uses less digits than its factorization.

21730274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178180.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 21730274 is about 4661.5741976290. The cubic root of 21730274 is about 279.0540955302.

Adding to 21730274 its reverse (47203712), we get a palindrome (68933986).

The spelling of 21730274 in words is "twenty-one million, seven hundred thirty thousand, two hundred seventy-four".