222121202110221 has 4 divisors (see below), whose sum is σ = 296161602813632. Its totient is φ = 148080801406812.

The previous prime is 222121202110189. The next prime is 222121202110277. The reversal of 222121202110221 is 122011202121222.

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 222121202110221 - 2⁵ = 222121202110189 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 (222121202010221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37020200351701 + ... + 37020200351706.

It is an arithmetic number, because the mean of its divisors is an integer number (74040400703408).

Almost surely, 2^{222121202110221} is an apocalyptic number.

It is an amenable number.

222121202110221 is a deficient number, since it is larger than the sum of its proper divisors (74040400703411).

222121202110221 is an equidigital number, since it uses as much as digits as its factorization.

222121202110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74040400703410.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 222121202110221 its reverse (122011202121222), we get a palindrome (344132404231443).

The spelling of 222121202110221 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, two hundred two million, one hundred ten thousand, two hundred twenty-one".