221032123121 has 8 divisors (see below), whose sum is σ = 228791962920. Its totient is φ = 213281486208.

The previous prime is 221032123069. The next prime is 221032123133. The reversal of 221032123121 is 121321230122.

It can be written as a sum of positive squares in 4 ways, for example, as 80077680400 + 140954442721 = 282980^2 + 375439^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221032123121 - 2³⁰ = 219958381297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221032123093 and 221032123102.

It is not an unprimeable number, because it can be changed into a prime (221032123621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2251826 + ... + 2347931.

It is an arithmetic number, because the mean of its divisors is an integer number (28598995365).

Almost surely, 2^221032123121 is an apocalyptic number.

It is an amenable number.

221032123121 is a deficient number, since it is larger than the sum of its proper divisors (7759839799).

221032123121 is a wasteful number, since it uses less digits than its factorization.

221032123121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4601443.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 221032123121 its reverse (121321230122), we get a palindrome (342353353243).

The spelling of 221032123121 in words is "two hundred twenty-one billion, thirty-two million, one hundred twenty-three thousand, one hundred twenty-one".