21233761 has 8 divisors (see below), whose sum is σ = 22576320. Its totient is φ = 19926192.

The previous prime is 21233753. The next prime is 21233813. The reversal of 21233761 is 16733212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21233761 - 2³ = 21233753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21233161) 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, 7491 + ... + 9928.

It is an arithmetic number, because the mean of its divisors is an integer number (2822040).

Almost surely, 2^21233761 is an apocalyptic number.

It is an amenable number.

21233761 is a deficient number, since it is larger than the sum of its proper divisors (1342559).

21233761 is a wasteful number, since it uses less digits than its factorization.

21233761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17495.

The product of its digits is 1512, while the sum is 25.

The square root of 21233761 is about 4608.0105251616. The cubic root of 21233761 is about 276.9123391630.

Adding to 21233761 its reverse (16733212), we get a palindrome (37966973).

The spelling of 21233761 in words is "twenty-one million, two hundred thirty-three thousand, seven hundred sixty-one".