201121700556 has 96 divisors (see below), whose sum is σ = 568284595200. Its totient is φ = 54043951104.

The previous prime is 201121700467. The next prime is 201121700557. The reversal of 201121700556 is 655007121102.

It is not an unprimeable number, because it can be changed into a prime (201121700557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1947436 + ... + 2048108.

It is an arithmetic number, because the mean of its divisors is an integer number (5919631200).

Almost surely, 2^201121700556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201121700556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284142297600).

201121700556 is an abundant number, since it is smaller than the sum of its proper divisors (367162894644).

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

201121700556 is a wasteful number, since it uses less digits than its factorization.

201121700556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102103 (or 102101 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 30.

Adding to 201121700556 its reverse (655007121102), we get a palindrome (856128821658).

The spelling of 201121700556 in words is "two hundred one billion, one hundred twenty-one million, seven hundred thousand, five hundred fifty-six".