21463634 has 16 divisors (see below), whose sum is σ = 32780160. Its totient is φ = 10538640.

The previous prime is 21463633. The next prime is 21463649. The reversal of 21463634 is 43636412.

It is a junction number, because it is equal to n+sod(n) for n = 21463597 and 21463606.

It is not an unprimeable number, because it can be changed into a prime (21463633) 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, 39404 + ... + 39944.

It is an arithmetic number, because the mean of its divisors is an integer number (2048760).

Almost surely, 2^21463634 is an apocalyptic number.

21463634 is a deficient number, since it is larger than the sum of its proper divisors (11316526).

21463634 is a wasteful number, since it uses less digits than its factorization.

21463634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865.

The product of its digits is 10368, while the sum is 29.

The square root of 21463634 is about 4632.8861414889. The cubic root of 21463634 is about 277.9080229859.

The spelling of 21463634 in words is "twenty-one million, four hundred sixty-three thousand, six hundred thirty-four".