1220011211121 has 32 divisors (see below), whose sum is σ = 1701153484800. Its totient is φ = 776962053504.

The previous prime is 1220011211093. The next prime is 1220011211131. The reversal of 1220011211121 is 1211121100221.

It is a happy number.

It is not a de Polignac number, because 1220011211121 - 2⁹ = 1220011210609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220011211121.

It is not an unprimeable number, because it can be changed into a prime (1220011211131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8410221 + ... + 8554053.

It is an arithmetic number, because the mean of its divisors is an integer number (53161046400).

Almost surely, 2^{1220011211121} is an apocalyptic number.

It is an amenable number.

1220011211121 is a deficient number, since it is larger than the sum of its proper divisors (481142273679).

1220011211121 is a wasteful number, since it uses less digits than its factorization.

1220011211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145325.

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

Adding to 1220011211121 its reverse (1211121100221), we get a palindrome (2431132311342).

The spelling of 1220011211121 in words is "one trillion, two hundred twenty billion, eleven million, two hundred eleven thousand, one hundred twenty-one".