1221121201112 has 8 divisors (see below), whose sum is σ = 2289602252100. Its totient is φ = 610560600552.

The previous prime is 1221121201103. The next prime is 1221121201117. The reversal of 1221121201112 is 2111021211221.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1221121201112² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221121201117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76320075062 + ... + 76320075077.

Almost surely, 2^{1221121201112} is an apocalyptic number.

It is an amenable number.

1221121201112 is a deficient number, since it is larger than the sum of its proper divisors (1068481050988).

1221121201112 is a wasteful number, since it uses less digits than its factorization.

1221121201112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152640150145 (or 152640150141 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1221121201112 its reverse (2111021211221), we get a palindrome (3332142412333).

The spelling of 1221121201112 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred one thousand, one hundred twelve".