1221301013312 has 28 divisors (see below), whose sum is σ = 2448503944740. Its totient is φ = 604355137536.

The previous prime is 1221301013299. The next prime is 1221301013327. The reversal of 1221301013312 is 2133101031221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 283858790656 + 937442222656 = 532784^2 + 968216^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98358887 + ... + 98371302.

It is an arithmetic number, because the mean of its divisors is an integer number (87446569455).

Almost surely, 2^{1221301013312} is an apocalyptic number.

It is an amenable number.

1221301013312 is an abundant number, since it is smaller than the sum of its proper divisors (1227202931428).

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

1221301013312 is an equidigital number, since it uses as much as digits as its factorization.

1221301013312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196730298 (or 196730288 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1221301013312 its reverse (2133101031221), we get a palindrome (3354402044533).

The spelling of 1221301013312 in words is "one trillion, two hundred twenty-one billion, three hundred one million, thirteen thousand, three hundred twelve".