221000022001 has 4 divisors (see below), whose sum is σ = 241090933104. Its totient is φ = 200909110900.

The previous prime is 221000021993. The next prime is 221000022017. The reversal of 221000022001 is 100220000122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221000022001 - 2³ = 221000021993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221000022601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10045455535 + ... + 10045455556.

It is an arithmetic number, because the mean of its divisors is an integer number (60272733276).

Almost surely, 2^221000022001 is an apocalyptic number.

It is an amenable number.

221000022001 is a deficient number, since it is larger than the sum of its proper divisors (20090911103).

221000022001 is a wasteful number, since it uses less digits than its factorization.

221000022001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20090911102.

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

Adding to 221000022001 its reverse (100220000122), we get a palindrome (321220022123).

The spelling of 221000022001 in words is "two hundred twenty-one billion, twenty-two thousand, one".