21377332 has 6 divisors (see below), whose sum is σ = 37410338. Its totient is φ = 10688664.

The previous prime is 21377329. The next prime is 21377333. The reversal of 21377332 is 23377312.

It can be written as a sum of positive squares in only one way, i.e., 20304036 + 1073296 = 4506^2 + 1036^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21377332.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21377333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2672163 + ... + 2672170.

Almost surely, 2^21377332 is an apocalyptic number.

It is an amenable number.

21377332 is a deficient number, since it is larger than the sum of its proper divisors (16033006).

21377332 is a wasteful number, since it uses less digits than its factorization.

21377332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5344337 (or 5344335 counting only the distinct ones).

The product of its digits is 5292, while the sum is 28.

The square root of 21377332 is about 4623.5626955844. The cubic root of 21377332 is about 277.5350473820.

The spelling of 21377332 in words is "twenty-one million, three hundred seventy-seven thousand, three hundred thirty-two".