21232755 has 24 divisors (see below), whose sum is σ = 37662768. Its totient is φ = 11059776.

The previous prime is 21232741. The next prime is 21232777. The reversal of 21232755 is 55723212.

It is not a de Polignac number, because 21232755 - 2⁵ = 21232723 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3552 + ... + 7421.

It is an arithmetic number, because the mean of its divisors is an integer number (1569282).

Almost surely, 2^21232755 is an apocalyptic number.

21232755 is a deficient number, since it is larger than the sum of its proper divisors (16430013).

21232755 is a wasteful number, since it uses less digits than its factorization.

21232755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11027 (or 11024 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 21232755 is about 4607.9013661319. The cubic root of 21232755 is about 276.9079659668.

Adding to 21232755 its reverse (55723212), we get a palindrome (76955967).

The spelling of 21232755 in words is "twenty-one million, two hundred thirty-two thousand, seven hundred fifty-five".