221221121202122 has 8 divisors (see below), whose sum is σ = 331836473319876. Its totient is φ = 110608963428832.

The previous prime is 221221121202089. The next prime is 221221121202203. The reversal of 221221121202122 is 221202121122122.

It can be written as a sum of positive squares in 2 ways, for example, as 205827198329041 + 15393922873081 = 14346679^2 + 3923509^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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, 798412973 + ... + 798690000.

Almost surely, 2^{221221121202122} is an apocalyptic number.

221221121202122 is a deficient number, since it is larger than the sum of its proper divisors (110615352117754).

221221121202122 is a wasteful number, since it uses less digits than its factorization.

221221121202122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597172232.

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

Adding to 221221121202122 its reverse (221202121122122), we get a palindrome (442423242324244).

The spelling of 221221121202122 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred two thousand, one hundred twenty-two".