221001202022121 has 16 divisors (see below), whose sum is σ = 327676898113920. Its totient is φ = 147213665211600.

The previous prime is 221001202022087. The next prime is 221001202022141. The reversal of 221001202022121 is 121220202100122.

It is a happy number.

221001202022121 is a `hidden beast` number, since 221 + 0 + 0 + 1 + 202 + 0 + 221 + 21 = 666.

It is not a de Polignac number, because 221001202022121 - 2⁷ = 221001202021993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221001202022094 and 221001202022103.

It is not an unprimeable number, because it can be changed into a prime (221001202022141) 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, 3346340530 + ... + 3346406571.

It is an arithmetic number, because the mean of its divisors is an integer number (20479806132120).

Almost surely, 2^{221001202022121} is an apocalyptic number.

It is an amenable number.

221001202022121 is a deficient number, since it is larger than the sum of its proper divisors (106675696091799).

221001202022121 is a wasteful number, since it uses less digits than its factorization.

221001202022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6692748333 (or 6692748327 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221001202022121 its reverse (121220202100122), we get a palindrome (342221404122243).

The spelling of 221001202022121 in words is "two hundred twenty-one trillion, one billion, two hundred two million, twenty-two thousand, one hundred twenty-one".