221201122002121 has 4 divisors (see below), whose sum is σ = 221201203144144. Its totient is φ = 221201040860100.

The previous prime is 221201122002109. The next prime is 221201122002137. The reversal of 221201122002121 is 121200221102122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221201122002121 - 2¹¹ = 221201122000073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221201122002151) 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, 36334395 + ... + 41983216.

It is an arithmetic number, because the mean of its divisors is an integer number (55300300786036).

Almost surely, 2^{221201122002121} is an apocalyptic number.

It is an amenable number.

221201122002121 is a deficient number, since it is larger than the sum of its proper divisors (81142023).

221201122002121 is an equidigital number, since it uses as much as digits as its factorization.

221201122002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81142022.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 221201122002121 its reverse (121200221102122), we get a palindrome (342401343104243).

The spelling of 221201122002121 in words is "two hundred twenty-one trillion, two hundred one billion, one hundred twenty-two million, two thousand, one hundred twenty-one".