221031031201 has 4 divisors (see below), whose sum is σ = 226422032004. Its totient is φ = 215640030400.

The previous prime is 221031031187. The next prime is 221031031217. The reversal of 221031031201 is 102130130122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 102130130122 = 2 ⋅51065065061.

It can be written as a sum of positive squares in 2 ways, for example, as 29489132176 + 191541899025 = 171724^2 + 437655^2 .

It is a cyclic number.

It is not a de Polignac number, because 221031031201 - 2²⁵ = 220997476769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221031031261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2695500340 + ... + 2695500421.

It is an arithmetic number, because the mean of its divisors is an integer number (56605508001).

Almost surely, 2^221031031201 is an apocalyptic number.

It is an amenable number.

221031031201 is a deficient number, since it is larger than the sum of its proper divisors (5391000803).

221031031201 is an equidigital number, since it uses as much as digits as its factorization.

221031031201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5391000802.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 221031031201 its reverse (102130130122), we get a palindrome (323161161323).

The spelling of 221031031201 in words is "two hundred twenty-one billion, thirty-one million, thirty-one thousand, two hundred one".