21233797 has 4 divisors (see below), whose sum is σ = 22867180. Its totient is φ = 19600416.

The previous prime is 21233753. The next prime is 21233813. The reversal of 21233797 is 79733212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13315201 + 7918596 = 3649^2 + 2814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21233797 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 (21233197) 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, 816672 + ... + 816697.

It is an arithmetic number, because the mean of its divisors is an integer number (5716795).

Almost surely, 2^21233797 is an apocalyptic number.

It is an amenable number.

21233797 is a deficient number, since it is larger than the sum of its proper divisors (1633383).

21233797 is a wasteful number, since it uses less digits than its factorization.

21233797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633382.

The product of its digits is 15876, while the sum is 34.

The square root of 21233797 is about 4608.0144314010. The cubic root of 21233797 is about 276.9124956566.

The spelling of 21233797 in words is "twenty-one million, two hundred thirty-three thousand, seven hundred ninety-seven".