1221001221012 has 24 divisors (see below), whose sum is σ = 3016591252416. Its totient is φ = 383059206528.

The previous prime is 1221001220981. The next prime is 1221001221073. The reversal of 1221001221012 is 2101221001221.

It is a super-3 number, since 3×1221001221012³ (a number of 37 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221001220982 and 1221001221000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2992649848 + ... + 2992650255.

It is an arithmetic number, because the mean of its divisors is an integer number (125691302184).

Almost surely, 2^{1221001221012} is an apocalyptic number.

1221001221012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221001221012 is an abundant number, since it is smaller than the sum of its proper divisors (1795590031404).

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

1221001221012 is a wasteful number, since it uses less digits than its factorization.

1221001221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5985300127 (or 5985300125 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221001221012 its reverse (2101221001221), we get a palindrome (3322222222233).

The spelling of 1221001221012 in words is "one trillion, two hundred twenty-one billion, one million, two hundred twenty-one thousand, twelve".