1211221122012 has 96 divisors (see below), whose sum is σ = 3437867865600. Its totient is φ = 365730422400.

The previous prime is 1211221121977. The next prime is 1211221122017. The reversal of 1211221122012 is 2102211221121.

1211221122012 is a `hidden beast` number, since 1 + 211 + 221 + 1 + 220 + 12 = 666.

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 (1211221122017) 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, 1480312 + ... + 2147967.

It is an arithmetic number, because the mean of its divisors is an integer number (35811123600).

Almost surely, 2^{1211221122012} is an apocalyptic number.

1211221122012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211221122012 is an abundant number, since it is smaller than the sum of its proper divisors (2226646743588).

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

1211221122012 is a wasteful number, since it uses less digits than its factorization.

1211221122012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3628584 (or 3628576 counting only the distinct ones).

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

Adding to 1211221122012 its reverse (2102211221121), we get a palindrome (3313432343133).

The spelling of 1211221122012 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, one hundred twenty-two thousand, twelve".