12213251540 has 48 divisors (see below), whose sum is σ = 29343401472. Its totient is φ = 4182886656.

The previous prime is 12213251539. The next prime is 12213251543. The reversal of 12213251540 is 4515231221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12213251543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84629 + ... + 177731.

It is an arithmetic number, because the mean of its divisors is an integer number (611320864).

Almost surely, 2^12213251540 is an apocalyptic number.

12213251540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12213251540 is an abundant number, since it is smaller than the sum of its proper divisors (17130149932).

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

12213251540 is a wasteful number, since it uses less digits than its factorization.

12213251540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94056 (or 94054 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 12213251540 its reverse (4515231221), we get a palindrome (16728482761).

The spelling of 12213251540 in words is "twelve billion, two hundred thirteen million, two hundred fifty-one thousand, five hundred forty".