12221001440 has 24 divisors (see below), whose sum is σ = 28872116280. Its totient is φ = 4888400512.

The previous prime is 12221001413. The next prime is 12221001461. The reversal of 12221001440 is 4410012221.

It is a congruent number.

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, 38190470 + ... + 38190789.

It is an arithmetic number, because the mean of its divisors is an integer number (1203004845).

Almost surely, 2^12221001440 is an apocalyptic number.

12221001440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221001440 is an abundant number, since it is smaller than the sum of its proper divisors (16651114840).

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

12221001440 is an equidigital number, since it uses as much as digits as its factorization.

12221001440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76381274 (or 76381266 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 12221001440 its reverse (4410012221), we get a palindrome (16631013661).

The spelling of 12221001440 in words is "twelve billion, two hundred twenty-one million, one thousand, four hundred forty".