221310420121 has 16 divisors (see below), whose sum is σ = 258331866624. Its totient is φ = 185641150464.

The previous prime is 221310420103. The next prime is 221310420127. The reversal of 221310420121 is 121024013122.

It is not a de Polignac number, because 221310420121 - 2¹¹ = 221310418073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221310420127) 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, 4434121 + ... + 4483753.

It is an arithmetic number, because the mean of its divisors is an integer number (16145741664).

Almost surely, 2^221310420121 is an apocalyptic number.

It is an amenable number.

221310420121 is a deficient number, since it is larger than the sum of its proper divisors (37021446503).

221310420121 is a wasteful number, since it uses less digits than its factorization.

221310420121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63240.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 221310420121 its reverse (121024013122), we get a palindrome (342334433243).

The spelling of 221310420121 in words is "two hundred twenty-one billion, three hundred ten million, four hundred twenty thousand, one hundred twenty-one".