1221000133012 has 48 divisors (see below), whose sum is σ = 2502880248960. Its totient is φ = 514995891200.

The previous prime is 1221000132983. The next prime is 1221000133069. The reversal of 1221000133012 is 2103310001221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11442337 + ... + 11548552.

It is an arithmetic number, because the mean of its divisors is an integer number (52143338520).

Almost surely, 2^{1221000133012} is an apocalyptic number.

It is an amenable number.

1221000133012 is an abundant number, since it is smaller than the sum of its proper divisors (1281880115948).

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

1221000133012 is a wasteful number, since it uses less digits than its factorization.

1221000133012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22990992 (or 22990990 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 1221000133012 its reverse (2103310001221), we get a palindrome (3324310134233).

The spelling of 1221000133012 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-three thousand, twelve".