221020020001 has 32 divisors (see below), whose sum is σ = 252539596800. Its totient is φ = 191471913600.

The previous prime is 221020019993. The next prime is 221020020007. The reversal of 221020020001 is 100020020122.

It is not a de Polignac number, because 221020020001 - 2³ = 221020019993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221020020001.

It is not an unprimeable number, because it can be changed into a prime (221020020007) 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, 130087450 + ... + 130089148.

It is an arithmetic number, because the mean of its divisors is an integer number (7891862400).

Almost surely, 2^221020020001 is an apocalyptic number.

It is an amenable number.

221020020001 is a deficient number, since it is larger than the sum of its proper divisors (31519576799).

221020020001 is a wasteful number, since it uses less digits than its factorization.

221020020001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3357.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 221020020001 its reverse (100020020122), we get a palindrome (321040040123).

The spelling of 221020020001 in words is "two hundred twenty-one billion, twenty million, twenty thousand, one".