21771332 has 12 divisors (see below), whose sum is σ = 41563536. Its totient is φ = 9896040.

The previous prime is 21771329. The next prime is 21771353. The reversal of 21771332 is 23317712.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247358 + ... + 247445.

It is an arithmetic number, because the mean of its divisors is an integer number (3463628).

Almost surely, 2^21771332 is an apocalyptic number.

21771332 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21771332 is a deficient number, since it is larger than the sum of its proper divisors (19792204).

21771332 is a wasteful number, since it uses less digits than its factorization.

21771332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494818 (or 494816 counting only the distinct ones).

The product of its digits is 1764, while the sum is 26.

The square root of 21771332 is about 4665.9759965092. The cubic root of 21771332 is about 279.2297367363.

The spelling of 21771332 in words is "twenty-one million, seven hundred seventy-one thousand, three hundred thirty-two".