21232869 has 16 divisors (see below), whose sum is σ = 32558592. Its totient is φ = 12056688.

The previous prime is 21232867. The next prime is 21232879. The reversal of 21232869 is 96823212.

It is a happy number.

It is not a de Polignac number, because 21232869 - 2¹ = 21232867 is a prime.

It is a super-2 number, since 2×21232869² = 901669451942322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 322 + ... + 6524.

It is an arithmetic number, because the mean of its divisors is an integer number (2034912).

Almost surely, 2^21232869 is an apocalyptic number.

It is an amenable number.

21232869 is a deficient number, since it is larger than the sum of its proper divisors (11325723).

21232869 is a wasteful number, since it uses less digits than its factorization.

21232869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6376.

The product of its digits is 10368, while the sum is 33.

The square root of 21232869 is about 4607.9137361717. The cubic root of 21232869 is about 276.9084615446.

The spelling of 21232869 in words is "twenty-one million, two hundred thirty-two thousand, eight hundred sixty-nine".