221001211120121 has 8 divisors (see below), whose sum is σ = 221036873565000. Its totient is φ = 220965549799680.

The previous prime is 221001211120097. The next prime is 221001211120159. The reversal of 221001211120121 is 121021112100122.

It can be written as a sum of positive squares in 4 ways, for example, as 122928553909225 + 98072657210896 = 11087315^2 + 9903164^2 .

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 221001211120121 - 2⁴⁶ = 150632466942457 is a prime.

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 221001211120121.

It is not an unprimeable number, because it can be changed into a prime (221001211120181) 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, 450390491 + ... + 450880911.

It is an arithmetic number, because the mean of its divisors is an integer number (27629609195625).

Almost surely, 2^{221001211120121} is an apocalyptic number.

It is an amenable number.

221001211120121 is a deficient number, since it is larger than the sum of its proper divisors (35662444879).

221001211120121 is an equidigital number, since it uses as much as digits as its factorization.

221001211120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562219.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221001211120121 its reverse (121021112100122), we get a palindrome (342022323220243).

The spelling of 221001211120121 in words is "two hundred twenty-one trillion, one billion, two hundred eleven million, one hundred twenty thousand, one hundred twenty-one".