21227634 has 24 divisors (see below), whose sum is σ = 46749612. Its totient is φ = 6959520.

The previous prime is 21227629. The next prime is 21227671. The reversal of 21227634 is 43672212.

21227634 is a `hidden beast` number, since 2 + 1 + 2 + 27 + 634 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21206025 + 21609 = 4605^2 + 147^2 .

It is a super-2 number, since 2×21227634² = 901224890475912, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21227598 and 21227607.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8569 + ... + 10764.

Almost surely, 2^21227634 is an apocalyptic number.

21227634 is an abundant number, since it is smaller than the sum of its proper divisors (25521978).

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

21227634 is a wasteful number, since it uses less digits than its factorization.

21227634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19402 (or 19399 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 21227634 is about 4607.3456566661. The cubic root of 21227634 is about 276.8857022566.

Adding to 21227634 its reverse (43672212), we get a palindrome (64899846).

The spelling of 21227634 in words is "twenty-one million, two hundred twenty-seven thousand, six hundred thirty-four".