1212121011222 has 128 divisors (see below), whose sum is σ = 2980959736320. Its totient is φ = 362006392320.

The previous prime is 1212121011209. The next prime is 1212121011229. The reversal of 1212121011222 is 2221101212121.

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 = 1212121011195 and 1212121011204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212121011229) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 62127993 + ... + 62147499.

It is an arithmetic number, because the mean of its divisors is an integer number (23288747940).

Almost surely, 2^{1212121011222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212121011222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1490479868160).

1212121011222 is an abundant number, since it is smaller than the sum of its proper divisors (1768838725098).

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

1212121011222 is a wasteful number, since it uses less digits than its factorization.

1212121011222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21035 (or 21029 counting only the distinct ones).

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

Adding to 1212121011222 its reverse (2221101212121), we get a palindrome (3433222223343).

The spelling of 1212121011222 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, eleven thousand, two hundred twenty-two".