1221111200121 has 8 divisors (see below), whose sum is σ = 1648757738880. Its totient is φ = 803769397392.

The previous prime is 1221111200117. The next prime is 1221111200137. The reversal of 1221111200121 is 1210021111221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221111200121 - 2² = 1221111200117 is a prime.

It is a super-2 number, since 2×1221111200121² (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 1221111200121.

It is not an unprimeable number, because it can be changed into a prime (1221111200171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2576183730 + ... + 2576184203.

It is an arithmetic number, because the mean of its divisors is an integer number (206094717360).

Almost surely, 2^{1221111200121} is an apocalyptic number.

It is an amenable number.

1221111200121 is a deficient number, since it is larger than the sum of its proper divisors (427646538759).

1221111200121 is an equidigital number, since it uses as much as digits as its factorization.

1221111200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5152368015.

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

Adding to 1221111200121 its reverse (1210021111221), we get a palindrome (2431132311342).

The spelling of 1221111200121 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, two hundred thousand, one hundred twenty-one".