21268049985 has 64 divisors (see below), whose sum is σ = 46535247360. Its totient is φ = 8974644480.

The previous prime is 21268049951. The next prime is 21268049987. The reversal of 21268049985 is 58994086212.

It is a happy number.

21268049985 is a `hidden beast` number, since 2 + 12 + 68 + 0 + 499 + 85 = 666.

It is not a de Polignac number, because 21268049985 - 2⁷ = 21268049857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21268049987) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 853326 + ... + 877895.

It is an arithmetic number, because the mean of its divisors is an integer number (727113240).

Almost surely, 2^21268049985 is an apocalyptic number.

It is an amenable number.

21268049985 is an abundant number, since it is smaller than the sum of its proper divisors (25267197375).

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

21268049985 is a wasteful number, since it uses less digits than its factorization.

21268049985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731255 (or 1731249 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The spelling of 21268049985 in words is "twenty-one billion, two hundred sixty-eight million, forty-nine thousand, nine hundred eighty-five".