21227736 has 16 divisors (see below), whose sum is σ = 53069400. Its totient is φ = 7075904.

The previous prime is 21227711. The next prime is 21227753. The reversal of 21227736 is 63772212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 442221 + ... + 442268.

Almost surely, 2^21227736 is an apocalyptic number.

It is an amenable number.

21227736 is an abundant number, since it is smaller than the sum of its proper divisors (31841664).

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

21227736 is a wasteful number, since it uses less digits than its factorization.

21227736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884498 (or 884494 counting only the distinct ones).

The product of its digits is 7056, while the sum is 30.

The square root of 21227736 is about 4607.3567259330. The cubic root of 21227736 is about 276.8861457397.

Adding to 21227736 its reverse (63772212), we get a palindrome (84999948).

The spelling of 21227736 in words is "twenty-one million, two hundred twenty-seven thousand, seven hundred thirty-six".