221980871957 has 16 divisors (see below), whose sum is σ = 249499504128. Its totient is φ = 195957653760.

The previous prime is 221980871951. The next prime is 221980872007. The reversal of 221980871957 is 759178089122.

It is a cyclic number.

It is not a de Polignac number, because 221980871957 - 2¹⁰ = 221980870933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221980871896 and 221980871905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221980871951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1493732 + ... + 1635602.

It is an arithmetic number, because the mean of its divisors is an integer number (15593719008).

Almost surely, 2^221980871957 is an apocalyptic number.

It is an amenable number.

221980871957 is a deficient number, since it is larger than the sum of its proper divisors (27518632171).

221980871957 is a wasteful number, since it uses less digits than its factorization.

221980871957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147140.

The product of its (nonzero) digits is 5080320, while the sum is 59.

The spelling of 221980871957 in words is "two hundred twenty-one billion, nine hundred eighty million, eight hundred seventy-one thousand, nine hundred fifty-seven".