12221542540 has 48 divisors (see below), whose sum is σ = 26378577792. Its totient is φ = 4754071296.

The previous prime is 12221542519. The next prime is 12221542589. The reversal of 12221542540 is 4524512221.

It is a happy number.

12221542540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×12221542540² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12221542499 and 12221542508.

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 15 ways as a sum of consecutive naturals, for example, 106174 + ... + 188986.

It is an arithmetic number, because the mean of its divisors is an integer number (549553704).

Almost surely, 2^12221542540 is an apocalyptic number.

12221542540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221542540 is an abundant number, since it is smaller than the sum of its proper divisors (14157035252).

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

12221542540 is a wasteful number, since it uses less digits than its factorization.

12221542540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83026 (or 83024 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The spelling of 12221542540 in words is "twelve billion, two hundred twenty-one million, five hundred forty-two thousand, five hundred forty".