221002221001 has 4 divisors (see below), whose sum is σ = 222049625104. Its totient is φ = 219954816900.

The previous prime is 221002220951. The next prime is 221002221007. The reversal of 221002221001 is 100122200122.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-221002221001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221002221007) 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, 523701735 + ... + 523702156.

It is an arithmetic number, because the mean of its divisors is an integer number (55512406276).

Almost surely, 2^221002221001 is an apocalyptic number.

It is an amenable number.

221002221001 is a deficient number, since it is larger than the sum of its proper divisors (1047404103).

221002221001 is a wasteful number, since it uses less digits than its factorization.

221002221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047404102.

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

Adding to 221002221001 its reverse (100122200122), we get a palindrome (321124421123).

The spelling of 221002221001 in words is "two hundred twenty-one billion, two million, two hundred twenty-one thousand, one".