21121332 has 24 divisors (see below), whose sum is σ = 49358400. Its totient is φ = 7029696.

The previous prime is 21121319. The next prime is 21121333. The reversal of 21121332 is 23312112.

It is a super-2 number, since 2×21121332² = 892221330908448, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121333) 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, 12769 + ... + 14327.

It is an arithmetic number, because the mean of its divisors is an integer number (2056600).

Almost surely, 2^21121332 is an apocalyptic number.

It is an amenable number.

21121332 is an abundant number, since it is smaller than the sum of its proper divisors (28237068).

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

21121332 is a wasteful number, since it uses less digits than its factorization.

21121332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2695 (or 2693 counting only the distinct ones).

The product of its digits is 72, while the sum is 15.

The square root of 21121332 is about 4595.7950345941. The cubic root of 21121332 is about 276.4227401160.

Adding to 21121332 its reverse (23312112), we get a palindrome (44433444).

The spelling of 21121332 in words is "twenty-one million, one hundred twenty-one thousand, three hundred thirty-two".