1211121200020 has 24 divisors (see below), whose sum is σ = 2543401695744. Its totient is φ = 484439494176.

The previous prime is 1211121200011. The next prime is 1211121200089. The reversal of 1211121200020 is 200021211121.

It is a super-2 number, since 2×1211121200020² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 602437 + ... + 1668883.

It is an arithmetic number, because the mean of its divisors is an integer number (105975070656).

Almost surely, 2^{1211121200020} is an apocalyptic number.

1211121200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211121200020 is an abundant number, since it is smaller than the sum of its proper divisors (1332280495724).

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

1211121200020 is a wasteful number, since it uses less digits than its factorization.

1211121200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123239 (or 1123237 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1211121200020 its reverse (200021211121), we get a palindrome (1411142411141).

It can be divided in two parts, 1211121 and 200020, that added together give a palindrome (1411141).

The spelling of 1211121200020 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, two hundred thousand, twenty".