1221257620000 has 240 divisors, whose sum is σ = 3353860696032. Its totient is φ = 433762560000.

The previous prime is 1221257619983. The next prime is 1221257620067. The reversal of 1221257620000 is 267521221.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9395452 + ... + 9524548.

Almost surely, 2^{1221257620000} is an apocalyptic number.

1221257620000 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 1221257620000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1676930348016).

1221257620000 is an abundant number, since it is smaller than the sum of its proper divisors (2132603076032).

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

1221257620000 is a wasteful number, since it uses less digits than its factorization.

1221257620000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129181 (or 129158 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The spelling of 1221257620000 in words is "one trillion, two hundred twenty-one billion, two hundred fifty-seven million, six hundred twenty thousand".