21080268 has 36 divisors (see below), whose sum is σ = 58131528. Its totient is φ = 6387840.

The previous prime is 21080261. The next prime is 21080317. The reversal of 21080268 is 86208012.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (21080261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26221 + ... + 27012.

Almost surely, 2^21080268 is an apocalyptic number.

It is an amenable number.

21080268 is an abundant number, since it is smaller than the sum of its proper divisors (37051260).

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

21080268 is a wasteful number, since it uses less digits than its factorization.

21080268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53254 (or 53249 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 21080268 is about 4591.3252988652. The cubic root of 21080268 is about 276.2434839410.

The spelling of 21080268 in words is "twenty-one million, eighty thousand, two hundred sixty-eight".