1221021333412 has 36 divisors (see below), whose sum is σ = 2190529674900. Its totient is φ = 595523779840.

The previous prime is 1221021333397. The next prime is 1221021333439. The reversal of 1221021333412 is 2143331201221.

It can be written as a sum of positive squares in 6 ways, for example, as 24067178496 + 1196954154916 = 155136^2 + 1094054^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59409714 + ... + 59430262.

It is an arithmetic number, because the mean of its divisors is an integer number (60848046525).

Almost surely, 2^{1221021333412} is an apocalyptic number.

It is an amenable number.

1221021333412 is a deficient number, since it is larger than the sum of its proper divisors (969508341488).

1221021333412 is a wasteful number, since it uses less digits than its factorization.

1221021333412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29472 (or 29429 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 1221021333412 its reverse (2143331201221), we get a palindrome (3364352534633).

The spelling of 1221021333412 in words is "one trillion, two hundred twenty-one billion, twenty-one million, three hundred thirty-three thousand, four hundred twelve".