222735220561 has 4 divisors (see below), whose sum is σ = 254554537792. Its totient is φ = 190915903332.

The previous prime is 222735220523. The next prime is 222735220657. The reversal of 222735220561 is 165022537222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 222735220561 - 2¹¹ = 222735218513 is a prime.

It is a super-2 number, since 2×222735220561² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 222735220561.

It is not an unprimeable number, because it can be changed into a prime (222735220501) 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, 15909658605 + ... + 15909658618.

It is an arithmetic number, because the mean of its divisors is an integer number (63638634448).

Almost surely, 2^222735220561 is an apocalyptic number.

It is an amenable number.

222735220561 is a deficient number, since it is larger than the sum of its proper divisors (31819317231).

222735220561 is an equidigital number, since it uses as much as digits as its factorization.

222735220561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31819317230.

The product of its (nonzero) digits is 100800, while the sum is 37.

Adding to 222735220561 its reverse (165022537222), we get a palindrome (387757757783).

The spelling of 222735220561 in words is "two hundred twenty-two billion, seven hundred thirty-five million, two hundred twenty thousand, five hundred sixty-one".