21233055 has 16 divisors (see below), whose sum is σ = 34076160. Its totient is φ = 11289888.

The previous prime is 21233029. The next prime is 21233059. The reversal of 21233055 is 55033212.

It is not a de Polignac number, because 21233055 - 2¹⁹ = 20708767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3414 + ... + 7356.

It is an arithmetic number, because the mean of its divisors is an integer number (2129760).

Almost surely, 2^21233055 is an apocalyptic number.

21233055 is a deficient number, since it is larger than the sum of its proper divisors (12843105).

21233055 is a wasteful number, since it uses less digits than its factorization.

21233055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4310.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 21233055 is about 4607.9339187970. The cubic root of 21233055 is about 276.9092701153.

Adding to 21233055 its reverse (55033212), we get a palindrome (76266267).

The spelling of 21233055 in words is "twenty-one million, two hundred thirty-three thousand, fifty-five".