1221002121112 has 64 divisors (see below), whose sum is σ = 2421966744000. Its totient is φ = 575923814400.

The previous prime is 1221002121103. The next prime is 1221002121161. The reversal of 1221002121112 is 2111212001221.

It is a super-2 number, since 2×1221002121112² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4648264 + ... + 4903912.

It is an arithmetic number, because the mean of its divisors is an integer number (37843230375).

Almost surely, 2^{1221002121112} is an apocalyptic number.

It is an amenable number.

1221002121112 is a deficient number, since it is larger than the sum of its proper divisors (1200964622888).

1221002121112 is a wasteful number, since it uses less digits than its factorization.

1221002121112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256036 (or 256032 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221002121112 its reverse (2111212001221), we get a palindrome (3332214122333).

The spelling of 1221002121112 in words is "one trillion, two hundred twenty-one billion, two million, one hundred twenty-one thousand, one hundred twelve".