21232299 has 8 divisors (see below), whose sum is σ = 30883392. Its totient is φ = 12868040.

The previous prime is 21232259. The next prime is 21232307. The reversal of 21232299 is 99223212.

It is a happy number.

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 21232299 - 2⁹ = 21231787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21232229) 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, 321669 + ... + 321734.

It is an arithmetic number, because the mean of its divisors is an integer number (3860424).

Almost surely, 2^21232299 is an apocalyptic number.

21232299 is a deficient number, since it is larger than the sum of its proper divisors (9651093).

21232299 is a wasteful number, since it uses less digits than its factorization.

21232299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643417.

The product of its digits is 3888, while the sum is 30.

The square root of 21232299 is about 4607.8518856404. The cubic root of 21232299 is about 276.9059836375.

The spelling of 21232299 in words is "twenty-one million, two hundred thirty-two thousand, two hundred ninety-nine".