201121102120 has 16 divisors (see below), whose sum is σ = 452522479860. Its totient is φ = 80448440832.

The previous prime is 201121102103. The next prime is 201121102129. The reversal of 201121102120 is 21201121102.

It can be written as a sum of positive squares in 2 ways, for example, as 185810999364 + 15310102756 = 431058^2 + 123734^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 201121102120.

It is not an unprimeable number, because it can be changed into a prime (201121102129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2514013737 + ... + 2514013816.

Almost surely, 2^201121102120 is an apocalyptic number.

201121102120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201121102120 is an abundant number, since it is smaller than the sum of its proper divisors (251401377740).

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

201121102120 is a wasteful number, since it uses less digits than its factorization.

201121102120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5028027564 (or 5028027560 counting only the distinct ones).

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

Adding to 201121102120 its reverse (21201121102), we get a palindrome (222322223222).

The spelling of 201121102120 in words is "two hundred one billion, one hundred twenty-one million, one hundred two thousand, one hundred twenty".