1211213220020 has 24 divisors (see below), whose sum is σ = 2543568841800. Its totient is φ = 484481272832.

The previous prime is 1211213220001. The next prime is 1211213220043. The reversal of 1211213220020 is 200223121121.

It can be written as a sum of positive squares in 4 ways, for example, as 127690446244 + 1083522773776 = 357338^2 + 1040924^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3886136 + ... + 4186224.

It is an arithmetic number, because the mean of its divisors is an integer number (105982035075).

Almost surely, 2^{1211213220020} is an apocalyptic number.

1211213220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211213220020 is an abundant number, since it is smaller than the sum of its proper divisors (1332355621780).

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

1211213220020 is a wasteful number, since it uses less digits than its factorization.

1211213220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501907 (or 501905 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 1211213220020 its reverse (200223121121), we get a palindrome (1411436341141).

The spelling of 1211213220020 in words is "one trillion, two hundred eleven billion, two hundred thirteen million, two hundred twenty thousand, twenty".