221202121221121 has 16 divisors (see below), whose sum is σ = 223635617251200. Its totient is φ = 218771766259200.

The previous prime is 221202121221083. The next prime is 221202121221127. The reversal of 221202121221121 is 121122121202122.

It is not a de Polignac number, because 221202121221121 - 2²⁵ = 221202087666689 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221202121221092 and 221202121221101.

It is not an unprimeable number, because it can be changed into a prime (221202121221127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3257681271 + ... + 3257749171.

It is an arithmetic number, because the mean of its divisors is an integer number (13977226078200).

Almost surely, 2^{221202121221121} is an apocalyptic number.

It is an amenable number.

221202121221121 is a deficient number, since it is larger than the sum of its proper divisors (2433496030079).

221202121221121 is a wasteful number, since it uses less digits than its factorization.

221202121221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90504.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 221202121221121 its reverse (121122121202122), we get a palindrome (342324242423243).

The spelling of 221202121221121 in words is "two hundred twenty-one trillion, two hundred two billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-one".