222121202221 has 4 divisors (see below), whose sum is σ = 223248721212. Its totient is φ = 220993683232.

The previous prime is 222121202213. The next prime is 222121202231. The reversal of 222121202221 is 122202121222.

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 206147781225 + 15973420996 = 454035^2 + 126386^2 .

It is a cyclic number.

It is not a de Polignac number, because 222121202221 - 2³ = 222121202213 is a prime.

It is a super-3 number, since 3×222121202221³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222121202231) 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, 563759200 + ... + 563759593.

It is an arithmetic number, because the mean of its divisors is an integer number (55812180303).

Almost surely, 2^222121202221 is an apocalyptic number.

It is an amenable number.

222121202221 is a deficient number, since it is larger than the sum of its proper divisors (1127518991).

222121202221 is a wasteful number, since it uses less digits than its factorization.

222121202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127518990.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 222121202221 its reverse (122202121222), we get a palindrome (344323323443).

The spelling of 222121202221 in words is "two hundred twenty-two billion, one hundred twenty-one million, two hundred two thousand, two hundred twenty-one".