221020323001 has 16 divisors (see below), whose sum is σ = 233218440000. Its totient is φ = 208879128000.

The previous prime is 221020322989. The next prime is 221020323011. The reversal of 221020323001 is 100323020122.

It is a cyclic number.

It is not a de Polignac number, because 221020323001 - 2¹⁵ = 221020290233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221020323011) 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, 36223851 + ... + 36229951.

It is an arithmetic number, because the mean of its divisors is an integer number (14576152500).

Almost surely, 2^221020323001 is an apocalyptic number.

It is an amenable number.

221020323001 is a deficient number, since it is larger than the sum of its proper divisors (12198116999).

221020323001 is a wasteful number, since it uses less digits than its factorization.

221020323001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10440.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 221020323001 its reverse (100323020122), we get a palindrome (321343343123).

The spelling of 221020323001 in words is "two hundred twenty-one billion, twenty million, three hundred twenty-three thousand, one".