22405500221 has 4 divisors (see below), whose sum is σ = 24129000252. Its totient is φ = 20682000192.

The previous prime is 22405500203. The next prime is 22405500241. The reversal of 22405500221 is 12200550422.

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 8535727321 + 13869772900 = 92389^2 + 117770^2 .

It is a cyclic number.

It is not a de Polignac number, because 22405500221 - 2³⁰ = 21331758397 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 (22405500241) 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, 861749996 + ... + 861750021.

It is an arithmetic number, because the mean of its divisors is an integer number (6032250063).

Almost surely, 2^22405500221 is an apocalyptic number.

It is an amenable number.

22405500221 is a deficient number, since it is larger than the sum of its proper divisors (1723500031).

22405500221 is a wasteful number, since it uses less digits than its factorization.

22405500221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1723500030.

The product of its (nonzero) digits is 1600, while the sum is 23.

The spelling of 22405500221 in words is "twenty-two billion, four hundred five million, five hundred thousand, two hundred twenty-one".