1221032386560 has 448 divisors, whose sum is σ = 4560372928512. Its totient is φ = 273145921536.

The previous prime is 1221032386547. The next prime is 1221032386579. The reversal of 1221032386560 is 656832301221.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (448).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40412419 + ... + 40442621.

Almost surely, 2^{1221032386560} is an apocalyptic number.

1221032386560 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 1221032386560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2280186464256).

1221032386560 is an abundant number, since it is smaller than the sum of its proper divisors (3339340541952).

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

1221032386560 is an equidigital number, since it uses as much as digits as its factorization.

1221032386560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30291 (or 30267 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

Adding to 1221032386560 its reverse (656832301221), we get a palindrome (1877864687781).

The spelling of 1221032386560 in words is "one trillion, two hundred twenty-one billion, thirty-two million, three hundred eighty-six thousand, five hundred sixty".