21227814460 has 24 divisors (see below), whose sum is σ = 44666012160. Its totient is φ = 8474439744.

The previous prime is 21227814457. The next prime is 21227814497. The reversal of 21227814460 is 6441872212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1032444 + ... + 1052803.

It is an arithmetic number, because the mean of its divisors is an integer number (1861083840).

Almost surely, 2^21227814460 is an apocalyptic number.

21227814460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21227814460 is an abundant number, since it is smaller than the sum of its proper divisors (23438197700).

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

21227814460 is a wasteful number, since it uses less digits than its factorization.

21227814460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2085765 (or 2085763 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 37.

The spelling of 21227814460 in words is "twenty-one billion, two hundred twenty-seven million, eight hundred fourteen thousand, four hundred sixty".