221211120221121 has 32 divisors (see below), whose sum is σ = 299972293125120. Its totient is φ = 144971211363264.

The previous prime is 221211120221071. The next prime is 221211120221141. The reversal of 221211120221121 is 121122021112122.

It is not a de Polignac number, because 221211120221121 - 2²¹ = 221211118123969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221211120221141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1205359315 + ... + 1205542823.

It is an arithmetic number, because the mean of its divisors is an integer number (9374134160160).

Almost surely, 2^{221211120221121} is an apocalyptic number.

It is an amenable number.

221211120221121 is a deficient number, since it is larger than the sum of its proper divisors (78761172903999).

221211120221121 is a wasteful number, since it uses less digits than its factorization.

221211120221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196005.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 221211120221121 its reverse (121122021112122), we get a palindrome (342333141333243).

The spelling of 221211120221121 in words is "two hundred twenty-one trillion, two hundred eleven billion, one hundred twenty million, two hundred twenty-one thousand, one hundred twenty-one".