1221112001121 has 16 divisors (see below), whose sum is σ = 1723947274368. Its totient is φ = 766177056000.

The previous prime is 1221112001101. The next prime is 1221112001143. The reversal of 1221112001121 is 1211002111221.

It is a happy number.

It is not a de Polignac number, because 1221112001121 - 2⁵ = 1221112001089 is a prime.

It is a super-2 number, since 2×1221112001121² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221112001121.

It is not an unprimeable number, because it can be changed into a prime (1221112001101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4975116 + ... + 5214786.

It is an arithmetic number, because the mean of its divisors is an integer number (107746704648).

Almost surely, 2^{1221112001121} is an apocalyptic number.

It is an amenable number.

1221112001121 is a deficient number, since it is larger than the sum of its proper divisors (502835273247).

1221112001121 is a wasteful number, since it uses less digits than its factorization.

1221112001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339592.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1221112001121 its reverse (1211002111221), we get a palindrome (2432114112342).

The spelling of 1221112001121 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, one thousand, one hundred twenty-one".