201120978820 has 24 divisors (see below), whose sum is σ = 426535783128. Its totient is φ = 79651872000.

The previous prime is 201120978811. The next prime is 201120978829. The reversal of 201120978820 is 28879021102.

It is an interprime number because it is at equal distance from previous prime (201120978811) and next prime (201120978829).

It can be written as a sum of positive squares in 4 ways, for example, as 105069332736 + 96051646084 = 324144^2 + 309922^2 .

It is not an unprimeable number, because it can be changed into a prime (201120978829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49780401 + ... + 49784440.

It is an arithmetic number, because the mean of its divisors is an integer number (17772324297).

Almost surely, 2^201120978820 is an apocalyptic number.

201120978820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201120978820 is an abundant number, since it is smaller than the sum of its proper divisors (225414804308).

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

201120978820 is a wasteful number, since it uses less digits than its factorization.

201120978820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99564951 (or 99564949 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 40.

Adding to 201120978820 its reverse (28879021102), we get a palindrome (229999999922).

It can be divided in two parts, 201 and 120978820, that added together give a palindrome (120979021).

The spelling of 201120978820 in words is "two hundred one billion, one hundred twenty million, nine hundred seventy-eight thousand, eight hundred twenty".