221010112122121 has 32 divisors (see below), whose sum is σ = 268240007669760. Its totient is φ = 177761583073536.

The previous prime is 221010112122091. The next prime is 221010112122139. The reversal of 221010112122121 is 121221211010122.

It is a happy number.

It is not a de Polignac number, because 221010112122121 - 2²¹ = 221010110024969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221010112123121) 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, 81788796 + ... + 84447778.

It is an arithmetic number, because the mean of its divisors is an integer number (8382500239680).

Almost surely, 2^{221010112122121} is an apocalyptic number.

It is an amenable number.

221010112122121 is a deficient number, since it is larger than the sum of its proper divisors (47229895547639).

221010112122121 is a wasteful number, since it uses less digits than its factorization.

221010112122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2661093.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221010112122121 its reverse (121221211010122), we get a palindrome (342231323132243).

The spelling of 221010112122121 in words is "two hundred twenty-one trillion, ten billion, one hundred twelve million, one hundred twenty-two thousand, one hundred twenty-one".