21549226 has 16 divisors (see below), whose sum is σ = 33076008. Its totient is φ = 10526400.

The previous prime is 21549221. The next prime is 21549257. The reversal of 21549226 is 62294512.

It can be written as a sum of positive squares in 4 ways, for example, as 18071001 + 3478225 = 4251^2 + 1865^2 .

It is not an unprimeable number, because it can be changed into a prime (21549221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20596 + ... + 21616.

Almost surely, 2^21549226 is an apocalyptic number.

21549226 is a deficient number, since it is larger than the sum of its proper divisors (11526782).

21549226 is a wasteful number, since it uses less digits than its factorization.

21549226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257.

The product of its digits is 8640, while the sum is 31.

The square root of 21549226 is about 4642.1143889396. The cubic root of 21549226 is about 278.2769439671.

The spelling of 21549226 in words is "twenty-one million, five hundred forty-nine thousand, two hundred twenty-six".