221200200021001 has 4 divisors (see below), whose sum is σ = 232842315811600. Its totient is φ = 209558084230404.

The previous prime is 221200200020993. The next prime is 221200200021011. The reversal of 221200200021001 is 100120002002122.

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 not a de Polignac number, because 221200200021001 - 2³ = 221200200020993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221200200021011) 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, 5821057895271 + ... + 5821057895308.

It is an arithmetic number, because the mean of its divisors is an integer number (58210578952900).

Almost surely, 2^{221200200021001} is an apocalyptic number.

It is an amenable number.

221200200021001 is a deficient number, since it is larger than the sum of its proper divisors (11642115790599).

221200200021001 is a wasteful number, since it uses less digits than its factorization.

221200200021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11642115790598.

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

Adding to 221200200021001 its reverse (100120002002122), we get a palindrome (321320202023123).

The spelling of 221200200021001 in words is "two hundred twenty-one trillion, two hundred billion, two hundred million, twenty-one thousand, one".