12121322440 has 32 divisors (see below), whose sum is σ = 27321468480. Its totient is φ = 4839908032.

The previous prime is 12121322413. The next prime is 12121322459. The reversal of 12121322440 is 4422312121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246604 + ... + 291643.

It is an arithmetic number, because the mean of its divisors is an integer number (853795890).

Almost surely, 2^12121322440 is an apocalyptic number.

12121322440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121322440 is an abundant number, since it is smaller than the sum of its proper divisors (15200146040).

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

12121322440 is a wasteful number, since it uses less digits than its factorization.

12121322440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538821 (or 538817 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 12121322440 its reverse (4422312121), we get a palindrome (16543634561).

The spelling of 12121322440 in words is "twelve billion, one hundred twenty-one million, three hundred twenty-two thousand, four hundred forty".