201221000112121 has 6 divisors (see below), whose sum is σ = 221176801776266. Its totient is φ = 182928181920000.

The previous prime is 201221000112047. The next prime is 201221000112151. The reversal of 201221000112121 is 121211000122102.

It can be written as a sum of positive squares in only one way, i.e., 167032877774400 + 34188122337721 = 12924120^2 + 5847061^2 .

It is not a de Polignac number, because 201221000112121 - 2⁹ = 201221000111609 is a prime.

It is a super-2 number, since 2×201221000112121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201221000112095 and 201221000112104.

It is not an unprimeable number, because it can be changed into a prime (201221000112151) 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, 831491735880 + ... + 831491736121.

Almost surely, 2^{201221000112121} is an apocalyptic number.

It is an amenable number.

201221000112121 is a deficient number, since it is larger than the sum of its proper divisors (19955801664145).

201221000112121 is a wasteful number, since it uses less digits than its factorization.

201221000112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662983472023 (or 1662983472012 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 201221000112121 its reverse (121211000122102), we get a palindrome (322432000234223).

The spelling of 201221000112121 in words is "two hundred one trillion, two hundred twenty-one billion, one hundred twelve thousand, one hundred twenty-one".