1211202020100 has 72 divisors (see below), whose sum is σ = 3625252968960. Its totient is φ = 311849713280.

The previous prime is 1211202020087. The next prime is 1211202020107. The reversal of 1211202020100 is 10202021121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (1211202020107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69600612 + ... + 69618011.

It is an arithmetic number, because the mean of its divisors is an integer number (50350735680).

Almost surely, 2^{1211202020100} is an apocalyptic number.

1211202020100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211202020100 is an abundant number, since it is smaller than the sum of its proper divisors (2414050948860).

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

1211202020100 is a wasteful number, since it uses less digits than its factorization.

1211202020100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139218669 (or 139218662 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1211202020100 its reverse (10202021121), we get a palindrome (1221404041221).

The spelling of 1211202020100 in words is "one trillion, two hundred eleven billion, two hundred two million, twenty thousand, one hundred".