1211100122020 has 24 divisors (see below), whose sum is σ = 2558011478904. Its totient is φ = 481639815936.

The previous prime is 1211100121997. The next prime is 1211100122039. The reversal of 1211100122020 is 202210011121.

It can be written as a sum of positive squares in 4 ways, for example, as 385822353316 + 825277768704 = 621146^2 + 908448^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175011009 + ... + 175017928.

It is an arithmetic number, because the mean of its divisors is an integer number (106583811621).

Almost surely, 2^{1211100122020} is an apocalyptic number.

1211100122020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211100122020 is an abundant number, since it is smaller than the sum of its proper divisors (1346911356884).

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

1211100122020 is a wasteful number, since it uses less digits than its factorization.

1211100122020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350029119 (or 350029117 counting only the distinct ones).

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

Adding to 1211100122020 its reverse (202210011121), we get a palindrome (1413310133141).

The spelling of 1211100122020 in words is "one trillion, two hundred eleven billion, one hundred million, one hundred twenty-two thousand, twenty".