221050222501 has 4 divisors (see below), whose sum is σ = 221560731532. Its totient is φ = 220539713472.

The previous prime is 221050222499. The next prime is 221050222511. The reversal of 221050222501 is 105222050122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29095830625 + 191954391876 = 170575^2 + 438126^2 .

It is a cyclic number.

It is not a de Polignac number, because 221050222501 - 2¹ = 221050222499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221050222511) 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, 255253866 + ... + 255254731.

It is an arithmetic number, because the mean of its divisors is an integer number (55390182883).

Almost surely, 2^221050222501 is an apocalyptic number.

It is an amenable number.

221050222501 is a deficient number, since it is larger than the sum of its proper divisors (510509031).

221050222501 is an equidigital number, since it uses as much as digits as its factorization.

221050222501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510509030.

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 221050222501 its reverse (105222050122), we get a palindrome (326272272623).

The spelling of 221050222501 in words is "two hundred twenty-one billion, fifty million, two hundred twenty-two thousand, five hundred one".