221002110020121 has 16 divisors (see below), whose sum is σ = 310183796505600. Its totient is φ = 139577851597968.

The previous prime is 221002110020053. The next prime is 221002110020129. The reversal of 221002110020121 is 121020011200122.

It is not a de Polignac number, because 221002110020121 - 2¹⁷ = 221002109889049 is a prime.

It is a super-2 number, since 2×221002110020121² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221002110020121.

It is not an unprimeable number, because it can be changed into a prime (221002110020129) 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, 30420181 + ... + 36978258.

It is an arithmetic number, because the mean of its divisors is an integer number (19386487281600).

Almost surely, 2^{221002110020121} is an apocalyptic number.

It is an amenable number.

221002110020121 is a deficient number, since it is larger than the sum of its proper divisors (89181686485479).

221002110020121 is a wasteful number, since it uses less digits than its factorization.

221002110020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67455988.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221002110020121 its reverse (121020011200122), we get a palindrome (342022121220243).

The spelling of 221002110020121 in words is "two hundred twenty-one trillion, two billion, one hundred ten million, twenty thousand, one hundred twenty-one".