1211220011121 has 8 divisors (see below), whose sum is σ = 1645430958720. Its totient is φ = 792244535472.

The previous prime is 1211220011119. The next prime is 1211220011143. The reversal of 1211220011121 is 1211100221121.

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 1211220011121 - 2¹ = 1211220011119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211220011121.

It is not an unprimeable number, because it can be changed into a prime (1211220011161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3808867801 + ... + 3808868118.

It is an arithmetic number, because the mean of its divisors is an integer number (205678869840).

Almost surely, 2^{1211220011121} is an apocalyptic number.

It is an amenable number.

1211220011121 is a deficient number, since it is larger than the sum of its proper divisors (434210947599).

1211220011121 is an equidigital number, since it uses as much as digits as its factorization.

1211220011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7617735975.

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

Adding to 1211220011121 its reverse (1211100221121), we get a palindrome (2422320232242).

The spelling of 1211220011121 in words is "one trillion, two hundred eleven billion, two hundred twenty million, eleven thousand, one hundred twenty-one".