180121700 has 72 divisors (see below), whose sum is σ = 428514240. Its totient is φ = 65174400.

The previous prime is 180121699. The next prime is 180121727. The reversal of 180121700 is 7121081.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 410081 + ... + 410519.

Almost surely, 2^180121700 is an apocalyptic number.

180121700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 180121700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214257120).

180121700 is an abundant number, since it is smaller than the sum of its proper divisors (248392540).

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

180121700 is a wasteful number, since it uses less digits than its factorization.

180121700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837 (or 830 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 180121700 is about 13420.9425898482. The cubic root of 180121700 is about 564.7488376443.

Adding to 180121700 its reverse (7121081), we get a palindrome (187242781).

The spelling of 180121700 in words is "one hundred eighty million, one hundred twenty-one thousand, seven hundred".