1221301421340 has 384 divisors, whose sum is σ = 4632067786752. Its totient is φ = 232181268480.

The previous prime is 1221301421323. The next prime is 1221301421383. The reversal of 1221301421340 is 431241031221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221301421340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6696804 + ... + 6876756.

It is an arithmetic number, because the mean of its divisors is an integer number (12062676528).

Almost surely, 2^{1221301421340} is an apocalyptic number.

1221301421340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221301421340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2316033893376).

1221301421340 is an abundant number, since it is smaller than the sum of its proper divisors (3410766365412).

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

1221301421340 is a wasteful number, since it uses less digits than its factorization.

1221301421340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180109 (or 180107 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 1221301421340 its reverse (431241031221), we get a palindrome (1652542452561).

The spelling of 1221301421340 in words is "one trillion, two hundred twenty-one billion, three hundred one million, four hundred twenty-one thousand, three hundred forty".