1211200021121 has 8 divisors (see below), whose sum is σ = 1218328456320. Its totient is φ = 1204091037072.

The previous prime is 1211200021033. The next prime is 1211200021153.

1211200021121 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 1211200021121 - 2²² = 1211195826817 is a prime.

It is a super-4 number, since 4×1211200021121⁴ (a number of 49 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211200021096 and 1211200021105.

It is not an unprimeable number, because it can be changed into a prime (1211200026121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4737875 + ... + 4986968.

It is an arithmetic number, because the mean of its divisors is an integer number (152291057040).

Almost surely, 2^{1211200021121} is an apocalyptic number.

It is an amenable number.

1211200021121 is a deficient number, since it is larger than the sum of its proper divisors (7128435199).

1211200021121 is an equidigital number, since it uses as much as digits as its factorization.

1211200021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9725575.

The product of its (nonzero) digits is 16, while the sum is 14.

It can be divided in two parts, 12112000 and 21121, that added together give a palindrome (12133121).

The spelling of 1211200021121 in words is "one trillion, two hundred eleven billion, two hundred million, twenty-one thousand, one hundred twenty-one".