21367633 has 4 divisors (see below), whose sum is σ = 24420160. Its totient is φ = 18315108.

The previous prime is 21367631. The next prime is 21367651. The reversal of 21367633 is 33676312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21367633 - 2¹ = 21367631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21367595 and 21367604.

It is not an unprimeable number, because it can be changed into a prime (21367631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1526253 + ... + 1526266.

It is an arithmetic number, because the mean of its divisors is an integer number (6105040).

Almost surely, 2^21367633 is an apocalyptic number.

It is an amenable number.

21367633 is a deficient number, since it is larger than the sum of its proper divisors (3052527).

21367633 is an equidigital number, since it uses as much as digits as its factorization.

21367633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3052526.

The product of its digits is 13608, while the sum is 31.

The square root of 21367633 is about 4622.5137100932. The cubic root of 21367633 is about 277.4930680302.

The spelling of 21367633 in words is "twenty-one million, three hundred sixty-seven thousand, six hundred thirty-three".