1221425345280 has 576 divisors, whose sum is σ = 4625078169600. Its totient is φ = 268906659840.

The previous prime is 1221425345263. The next prime is 1221425345281. The reversal of 1221425345280 is 825435241221.

It is not an unprimeable number, because it can be changed into a prime (1221425345281) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 87057306 + ... + 87071334.

It is an arithmetic number, because the mean of its divisors is an integer number (8029649600).

Almost surely, 2^{1221425345280} is an apocalyptic number.

1221425345280 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 1221425345280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2312539084800).

1221425345280 is an abundant number, since it is smaller than the sum of its proper divisors (3403652824320).

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

1221425345280 is a wasteful number, since it uses less digits than its factorization.

1221425345280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14180 (or 14166 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 39.

The spelling of 1221425345280 in words is "one trillion, two hundred twenty-one billion, four hundred twenty-five million, three hundred forty-five thousand, two hundred eighty".