1211121220122 has 48 divisors (see below), whose sum is σ = 2958294272640. Its totient is φ = 367006428360.

The previous prime is 1211121220037. The next prime is 1211121220123. The reversal of 1211121220122 is 2210221211121.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1211121220095 and 1211121220104.

It is not an unprimeable number, because it can be changed into a prime (1211121220123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92671858 + ... + 92684925.

It is an arithmetic number, because the mean of its divisors is an integer number (61631130680).

Almost surely, 2^{1211121220122} is an apocalyptic number.

1211121220122 is an abundant number, since it is smaller than the sum of its proper divisors (1747173052518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211121220122 is a wasteful number, since it uses less digits than its factorization.

1211121220122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185356816 (or 185356799 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1211121220122 its reverse (2210221211121), we get a palindrome (3421342431243).

Subtracting 1211121220122 from its reverse (2210221211121), we obtain a palindrome (999099990999).

The spelling of 1211121220122 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, two hundred twenty thousand, one hundred twenty-two".