21253105260 has 36 divisors (see below), whose sum is σ = 64467753168. Its totient is φ = 5667494688.

The previous prime is 21253105231. The next prime is 21253105273. The reversal of 21253105260 is 6250135212.

It is a happy number.

21253105260 is a `hidden beast` number, since 2 + 125 + 3 + 10 + 526 + 0 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59036224 + ... + 59036583.

Almost surely, 2^21253105260 is an apocalyptic number.

21253105260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21253105260 is an abundant number, since it is smaller than the sum of its proper divisors (43214647908).

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

21253105260 is a wasteful number, since it uses less digits than its factorization.

21253105260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118072822 (or 118072817 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The spelling of 21253105260 in words is "twenty-one billion, two hundred fifty-three million, one hundred five thousand, two hundred sixty".