1001221221012 has 24 divisors (see below), whose sum is σ = 2336464786656. Its totient is φ = 333700130208.

The previous prime is 1001221220999. The next prime is 1001221221023. The reversal of 1001221221012 is 2101221221001.

It is a junction number, because it is equal to n+sod(n) for n = 1001221220982 and 1001221221000.

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, 4930938 + ... + 5129969.

It is an arithmetic number, because the mean of its divisors is an integer number (97352699444).

Almost surely, 2^{1001221221012} is an apocalyptic number.

1001221221012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1001221221012 is an abundant number, since it is smaller than the sum of its proper divisors (1335243565644).

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

1001221221012 is a wasteful number, since it uses less digits than its factorization.

1001221221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10069207 (or 10069205 counting only the distinct ones).

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

Adding to 1001221221012 its reverse (2101221221001), we get a palindrome (3102442442013).

The spelling of 1001221221012 in words is "one trillion, one billion, two hundred twenty-one million, two hundred twenty-one thousand, twelve".