1201210100 has 18 divisors (see below), whose sum is σ = 2606626134. Its totient is φ = 480484000.

The previous prime is 1201210097. The next prime is 1201210139. The reversal of 1201210100 is 10121021.

It can be written as a sum of positive squares in 3 ways, for example, as 343657444 + 857552656 = 18538^2 + 29284^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6005951 + ... + 6006150.

It is an arithmetic number, because the mean of its divisors is an integer number (144812563).

Almost surely, 2^1201210100 is an apocalyptic number.

1201210100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201210100 is an abundant number, since it is smaller than the sum of its proper divisors (1405416034).

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

1201210100 is a wasteful number, since it uses less digits than its factorization.

1201210100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12012115 (or 12012108 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1201210100 is about 34658.4780392908. The cubic root of 1201210100 is about 1063.0156500514.

Adding to 1201210100 its reverse (10121021), we get a palindrome (1211331121).

The spelling of 1201210100 in words is "one billion, two hundred one million, two hundred ten thousand, one hundred".