21233380 has 24 divisors (see below), whose sum is σ = 50960448. Its totient is φ = 7279968.

The previous prime is 21233371. The next prime is 21233389. The reversal of 21233380 is 8333212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21233371) and next prime (21233389).

It is not an unprimeable number, because it can be changed into a prime (21233389) 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, 75694 + ... + 75973.

It is an arithmetic number, because the mean of its divisors is an integer number (2123352).

Almost surely, 2^21233380 is an apocalyptic number.

21233380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21233380 is an abundant number, since it is smaller than the sum of its proper divisors (29727068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21233380 is a wasteful number, since it uses less digits than its factorization.

21233380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151683 (or 151681 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 21233380 is about 4607.9691839247. The cubic root of 21233380 is about 276.9106829290.

Adding to 21233380 its reverse (8333212), we get a palindrome (29566592).

The spelling of 21233380 in words is "twenty-one million, two hundred thirty-three thousand, three hundred eighty".