21727266 has 16 divisors (see below), whose sum is σ = 47405088. Its totient is φ = 6584000.

The previous prime is 21727247. The next prime is 21727271. The reversal of 21727266 is 66272712.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164535 + ... + 164666.

It is an arithmetic number, because the mean of its divisors is an integer number (2962818).

Almost surely, 2^21727266 is an apocalyptic number.

21727266 is an abundant number, since it is smaller than the sum of its proper divisors (25677822).

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

21727266 is a wasteful number, since it uses less digits than its factorization.

21727266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329217.

The product of its digits is 14112, while the sum is 33.

The square root of 21727266 is about 4661.2515486723. The cubic root of 21727266 is about 279.0412189714.

Adding to 21727266 its reverse (66272712), we get a palindrome (87999978).

The spelling of 21727266 in words is "twenty-one million, seven hundred twenty-seven thousand, two hundred sixty-six".