21633341 has 4 divisors (see below), whose sum is σ = 21642684. Its totient is φ = 21624000.

The previous prime is 21633329. The next prime is 21633349. The reversal of 21633341 is 14333612.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9703225 + 11930116 = 3115^2 + 3454^2 .

It is a cyclic number.

It is not a de Polignac number, because 21633341 - 2¹⁴ = 21616957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21633349) 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, 1691 + ... + 6791.

It is an arithmetic number, because the mean of its divisors is an integer number (5410671).

Almost surely, 2^21633341 is an apocalyptic number.

It is an amenable number.

21633341 is a deficient number, since it is larger than the sum of its proper divisors (9343).

21633341 is an equidigital number, since it uses as much as digits as its factorization.

21633341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9342.

The product of its digits is 1296, while the sum is 23.

The square root of 21633341 is about 4651.1655528480. The cubic root of 21633341 is about 278.6385482173.

Adding to 21633341 its reverse (14333612), we get a palindrome (35966953).

The spelling of 21633341 in words is "twenty-one million, six hundred thirty-three thousand, three hundred forty-one".