21632264 has 16 divisors (see below), whose sum is σ = 40610220. Its totient is φ = 10802880.

The previous prime is 21632257. The next prime is 21632287. The reversal of 21632264 is 46223612.

It can be written as a sum of positive squares in 2 ways, for example, as 21548164 + 84100 = 4642^2 + 290^2 .

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, 10694 + ... + 12554.

Almost surely, 2^21632264 is an apocalyptic number.

It is an amenable number.

21632264 is a deficient number, since it is larger than the sum of its proper divisors (18977956).

21632264 is a wasteful number, since it uses less digits than its factorization.

21632264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3320 (or 3316 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

The square root of 21632264 is about 4651.0497739758. The cubic root of 21632264 is about 278.6339242021.

Adding to 21632264 its reverse (46223612), we get a palindrome (67855876).

The spelling of 21632264 in words is "twenty-one million, six hundred thirty-two thousand, two hundred sixty-four".