201212221120100 has 36 divisors (see below), whose sum is σ = 436660741702500. Its totient is φ = 80479317596160.

The previous prime is 201212221120081. The next prime is 201212221120129. The reversal of 201212221120100 is 1021122212102.

It can be written as a sum of positive squares in 6 ways, for example, as 1115862646336 + 200096358473764 = 1056344^2 + 14145542^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68183525 + ... + 71073324.

Almost surely, 2^{201212221120100} is an apocalyptic number.

201212221120100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201212221120100 is an abundant number, since it is smaller than the sum of its proper divisors (235448520582400).

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

201212221120100 is a wasteful number, since it uses less digits than its factorization.

201212221120100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139271312 (or 139271305 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 201212221120100 its reverse (1021122212102), we get a palindrome (202233343332202).

The spelling of 201212221120100 in words is "two hundred one trillion, two hundred twelve billion, two hundred twenty-one million, one hundred twenty thousand, one hundred".