221000212201121 has 4 divisors (see below), whose sum is σ = 221287598693700. Its totient is φ = 220712825708544.

The previous prime is 221000212201117. The next prime is 221000212201129. The reversal of 221000212201121 is 121102212000122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 152645530800400 + 68354681400721 = 12354980^2 + 8267689^2 .

It is a cyclic number.

It is not a de Polignac number, because 221000212201121 - 2² = 221000212201117 is a prime.

It is a super-2 number, since 2×221000212201121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221000212201121.

It is not an unprimeable number, because it can be changed into a prime (221000212201129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143693245136 + ... + 143693246673.

It is an arithmetic number, because the mean of its divisors is an integer number (55321899673425).

Almost surely, 2^{221000212201121} is an apocalyptic number.

It is an amenable number.

221000212201121 is a deficient number, since it is larger than the sum of its proper divisors (287386492579).

221000212201121 is an equidigital number, since it uses as much as digits as its factorization.

221000212201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287386492578.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221000212201121 its reverse (121102212000122), we get a palindrome (342102424201243).

The spelling of 221000212201121 in words is "two hundred twenty-one trillion, two hundred twelve million, two hundred one thousand, one hundred twenty-one".