221020220012201 has 4 divisors (see below), whose sum is σ = 221020321748304. Its totient is φ = 221020118276100.

The previous prime is 221020220012149. The next prime is 221020220012237. The reversal of 221020220012201 is 102210022020122.

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 221020220012201 - 2²² = 221020215817897 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 221020220012201.

It is not an unprimeable number, because it can be changed into a prime (221020220002201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47536595 + ... + 51978536.

It is an arithmetic number, because the mean of its divisors is an integer number (55255080437076).

Almost surely, 2^{221020220012201} is an apocalyptic number.

It is an amenable number.

221020220012201 is a deficient number, since it is larger than the sum of its proper divisors (101736103).

221020220012201 is an equidigital number, since it uses as much as digits as its factorization.

221020220012201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101736102.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221020220012201 its reverse (102210022020122), we get a palindrome (323230242032323).

The spelling of 221020220012201 in words is "two hundred twenty-one trillion, twenty billion, two hundred twenty million, twelve thousand, two hundred one".