1221504522312 has 32 divisors (see below), whose sum is σ = 3054380148000. Its totient is φ = 407085661824.

The previous prime is 1221504522223. The next prime is 1221504522317. The reversal of 1221504522312 is 2132254051221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221504522312.

It is not an unprimeable number, because it can be changed into a prime (1221504522317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5036062 + ... + 5273037.

It is an arithmetic number, because the mean of its divisors is an integer number (95449379625).

Almost surely, 2^{1221504522312} is an apocalyptic number.

1221504522312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221504522312 is an abundant number, since it is smaller than the sum of its proper divisors (1832875625688).

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

1221504522312 is a wasteful number, since it uses less digits than its factorization.

1221504522312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10314045 (or 10314041 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 1221504522312 its reverse (2132254051221), we get a palindrome (3353758573533).

The spelling of 1221504522312 in words is "one trillion, two hundred twenty-one billion, five hundred four million, five hundred twenty-two thousand, three hundred twelve".