180037201921 has 2 divisors, whose sum is σ = 180037201922. Its totient is φ = 180037201920.

The previous prime is 180037201873. The next prime is 180037201937. The reversal of 180037201921 is 129102730081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156253393521 + 23783808400 = 395289^2 + 154220^2 .

It is a cyclic number.

It is not a de Polignac number, because 180037201921 - 2¹¹ = 180037199873 is a prime.

It is not a weakly prime, because it can be changed into another prime (180037201621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90018600960 + 90018600961.

It is an arithmetic number, because the mean of its divisors is an integer number (90018600961).

Almost surely, 2^180037201921 is an apocalyptic number.

It is an amenable number.

180037201921 is a deficient number, since it is larger than the sum of its proper divisors (1).

180037201921 is an equidigital number, since it uses as much as digits as its factorization.

180037201921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 34.

The spelling of 180037201921 in words is "one hundred eighty billion, thirty-seven million, two hundred one thousand, nine hundred twenty-one".