222121222102121 has 6 divisors (see below), whose sum is σ = 226391263398510. Its totient is φ = 217930255644608.

The previous prime is 222121222101997. The next prime is 222121222102159. The reversal of 222121222102121 is 121201222121222.

It can be written as a sum of positive squares in 3 ways, for example, as 145207199538025 + 76914022564096 = 12050195^2 + 8770064^2 .

It is a de Polignac number, because none of the positive numbers 2^k-222121222102121 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (222121222102621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39537416576 + ... + 39537422193.

It is an arithmetic number, because the mean of its divisors is an integer number (37731877233085).

Almost surely, 2^{222121222102121} is an apocalyptic number.

It is an amenable number.

222121222102121 is a deficient number, since it is larger than the sum of its proper divisors (4270041296389).

222121222102121 is an frugal number, since it uses more digits than its factorization.

222121222102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79074838875 (or 79074838822 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 222121222102121 its reverse (121201222121222), we get a palindrome (343322444223343).

The spelling of 222121222102121 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, two hundred twenty-two million, one hundred two thousand, one hundred twenty-one".