21011268 has 24 divisors (see below), whose sum is σ = 49154560. Its totient is φ = 6985440.

The previous prime is 21011251. The next prime is 21011293. The reversal of 21011268 is 86211012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2973 + ... + 7131.

Almost surely, 2^21011268 is an apocalyptic number.

It is an amenable number.

21011268 is an abundant number, since it is smaller than the sum of its proper divisors (28143292).

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

21011268 is a wasteful number, since it uses less digits than its factorization.

21011268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4587 (or 4585 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 21011268 is about 4583.8049696731. The cubic root of 21011268 is about 275.9417541445.

The spelling of 21011268 in words is "twenty-one million, eleven thousand, two hundred sixty-eight".