1211121222012 has 60 divisors (see below), whose sum is σ = 3409657051416. Its totient is φ = 372652682400.

The previous prime is 1211121221951. The next prime is 1211121222019. The reversal of 1211121222012 is 2102221211121.

It is a super-2 number, since 2×1211121222012² (a number of 25 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211121222019) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 143766114 + ... + 143774537.

Almost surely, 2^{1211121222012} is an apocalyptic number.

1211121222012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211121222012 is an abundant number, since it is smaller than the sum of its proper divisors (2198535829404).

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

1211121222012 is a wasteful number, since it uses less digits than its factorization.

1211121222012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287540680 (or 287540669 counting only the distinct ones).

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

Adding to 1211121222012 its reverse (2102221211121), we get a palindrome (3313342433133).

The spelling of 1211121222012 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, two hundred twenty-two thousand, twelve".