21169332 has 18 divisors (see below), whose sum is σ = 53511458. Its totient is φ = 7056432.

The previous prime is 21169331. The next prime is 21169367. The reversal of 21169332 is 23396112.

It can be written as a sum of positive squares in only one way, i.e., 13351716 + 7817616 = 3654^2 + 2796^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21169296 and 21169305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21169331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 293983 + ... + 294054.

Almost surely, 2^21169332 is an apocalyptic number.

It is an amenable number.

21169332 is an abundant number, since it is smaller than the sum of its proper divisors (32342126).

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

21169332 is a wasteful number, since it uses less digits than its factorization.

21169332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588047 (or 588042 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 21169332 is about 4601.0142360136. The cubic root of 21169332 is about 276.6319796516.

The spelling of 21169332 in words is "twenty-one million, one hundred sixty-nine thousand, three hundred thirty-two".