1211200020020 has 24 divisors (see below), whose sum is σ = 2548966571424. Its totient is φ = 483442573856.

The previous prime is 1211200019993. The next prime is 1211200020089. The reversal of 1211200020020 is 200200021121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1211200019983 and 1211200020010.

It is a congruent number.

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, 64830062 + ... + 64848741.

It is an arithmetic number, because the mean of its divisors is an integer number (106206940476).

Almost surely, 2^{1211200020020} is an apocalyptic number.

1211200020020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211200020020 is an abundant number, since it is smaller than the sum of its proper divisors (1337766551404).

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

1211200020020 is a wasteful number, since it uses less digits than its factorization.

1211200020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129679279 (or 129679277 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1211200020020 its reverse (200200021121), we get a palindrome (1411400041141).

The spelling of 1211200020020 in words is "one trillion, two hundred eleven billion, two hundred million, twenty thousand, twenty".