2121112121022 has 64 divisors (see below), whose sum is σ = 4800841148160. Its totient is φ = 694023165792.

The previous prime is 2121112121021. The next prime is 2121112121047. The reversal of 2121112121022 is 2201212111212.

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 = 2121112120986 and 2121112121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121112121021) 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, 11913 + ... + 2059700.

It is an arithmetic number, because the mean of its divisors is an integer number (75013142940).

Almost surely, 2^{2121112121022} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121112121022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2400420574080).

2121112121022 is an abundant number, since it is smaller than the sum of its proper divisors (2679729027138).

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

2121112121022 is a wasteful number, since it uses less digits than its factorization.

2121112121022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2071974 (or 2071968 counting only the distinct ones).

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

Adding to 2121112121022 its reverse (2201212111212), we get a palindrome (4322324232234).

The spelling of 2121112121022 in words is "two trillion, one hundred twenty-one billion, one hundred twelve million, one hundred twenty-one thousand, twenty-two".