221020020020101 has 16 divisors (see below), whose sum is σ = 227133488419200. Its totient is φ = 214990829581248.

The previous prime is 221020020020087. The next prime is 221020020020147. The reversal of 221020020020101 is 101020020020122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221020020020101 - 2¹⁷ = 221020019889029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020020026101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18349566 + ... + 27906031.

It is an arithmetic number, because the mean of its divisors is an integer number (14195843026200).

Almost surely, 2^{221020020020101} is an apocalyptic number.

It is an amenable number.

221020020020101 is a deficient number, since it is larger than the sum of its proper divisors (6113468399099).

221020020020101 is a wasteful number, since it uses less digits than its factorization.

221020020020101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46256508.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221020020020101 its reverse (101020020020122), we get a palindrome (322040040040223).

The spelling of 221020020020101 in words is "two hundred twenty-one trillion, twenty billion, twenty million, twenty thousand, one hundred one".