21243856110280 has 16 divisors (see below), whose sum is σ = 47798676248220. Its totient is φ = 8497542444096.

The previous prime is 21243856110233. The next prime is 21243856110311. The reversal of 21243856110280 is 8201165834212.

It can be written as a sum of positive squares in 2 ways, for example, as 18901260563364 + 2342595546916 = 4347558^2 + 1530554^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265548201339 + ... + 265548201418.

Almost surely, 2^{21243856110280} is an apocalyptic number.

21243856110280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21243856110280 is an abundant number, since it is smaller than the sum of its proper divisors (26554820137940).

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

21243856110280 is a wasteful number, since it uses less digits than its factorization.

21243856110280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531096402768 (or 531096402764 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 43.

The spelling of 21243856110280 in words is "twenty-one trillion, two hundred forty-three billion, eight hundred fifty-six million, one hundred ten thousand, two hundred eighty".