21101268 has 12 divisors (see below), whose sum is σ = 49236320. Its totient is φ = 7033752.

The previous prime is 21101263. The next prime is 21101273. The reversal of 21101268 is 86210112.

It is an interprime number because it is at equal distance from previous prime (21101263) and next prime (21101273).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21101268² = 890527022415648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879208 + ... + 879231.

Almost surely, 2^21101268 is an apocalyptic number.

It is an amenable number.

21101268 is an abundant number, since it is smaller than the sum of its proper divisors (28135052).

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

21101268 is a wasteful number, since it uses less digits than its factorization.

21101268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758446 (or 1758444 counting only the distinct ones).

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

The square root of 21101268 is about 4593.6116509779. The cubic root of 21101268 is about 276.3351840384.

The spelling of 21101268 in words is "twenty-one million, one hundred one thousand, two hundred sixty-eight".