222121111011221 has 4 divisors (see below), whose sum is σ = 222270285701100. Its totient is φ = 221971936321344.

The previous prime is 222121111011199. The next prime is 222121111011313. The reversal of 222121111011221 is 122110111121222.

It is a happy number.

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 64520831340196 + 157600279671025 = 8032486^2 + 12553895^2 .

It is a cyclic number.

It is not a de Polignac number, because 222121111011221 - 2⁶ = 222121111011157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222121111011193 and 222121111011202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222121111011421) 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, 74587342706 + ... + 74587345683.

It is an arithmetic number, because the mean of its divisors is an integer number (55567571425275).

Almost surely, 2^{222121111011221} is an apocalyptic number.

It is an amenable number.

222121111011221 is a deficient number, since it is larger than the sum of its proper divisors (149174689879).

222121111011221 is a wasteful number, since it uses less digits than its factorization.

222121111011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149174689878.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 222121111011221 its reverse (122110111121222), we get a palindrome (344231222132443).

The spelling of 222121111011221 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, one hundred eleven million, eleven thousand, two hundred twenty-one".