221201012211121 has 16 divisors (see below), whose sum is σ = 247489623590400. Its totient is φ = 196616756464128.

The previous prime is 221201012211107. The next prime is 221201012211133. The reversal of 221201012211121 is 121112210102122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221201012211121 - 2¹⁵ = 221201012178353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221201012211161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3580548156 + ... + 3580609933.

It is an arithmetic number, because the mean of its divisors is an integer number (15468101474400).

Almost surely, 2^{221201012211121} is an apocalyptic number.

It is an amenable number.

221201012211121 is a deficient number, since it is larger than the sum of its proper divisors (26288611379279).

221201012211121 is a wasteful number, since it uses less digits than its factorization.

221201012211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7161158208.

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

Adding to 221201012211121 its reverse (121112210102122), we get a palindrome (342313222313243).

The spelling of 221201012211121 in words is "two hundred twenty-one trillion, two hundred one billion, twelve million, two hundred eleven thousand, one hundred twenty-one".