1201212210100 has 108 divisors (see below), whose sum is σ = 3043478290860. Its totient is φ = 410312716800.

The previous prime is 1201212210061. The next prime is 1201212210109. The reversal of 1201212210100 is 10122121021.

It can be written as a sum of positive squares in 6 ways, for example, as 80586718884 + 1120625491216 = 283878^2 + 1058596^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201212210109) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 862440 + ... + 1773760.

It is an arithmetic number, because the mean of its divisors is an integer number (28180354545).

Almost surely, 2^{1201212210100} is an apocalyptic number.

1201212210100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1201212210100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1521739145430).

1201212210100 is an abundant number, since it is smaller than the sum of its proper divisors (1842266080760).

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

1201212210100 is a wasteful number, since it uses less digits than its factorization.

1201212210100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911618 (or 911604 counting only the distinct ones).

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

Adding to 1201212210100 its reverse (10122121021), we get a palindrome (1211334331121).

The spelling of 1201212210100 in words is "one trillion, two hundred one billion, two hundred twelve million, two hundred ten thousand, one hundred".