220201001121221 has 4 divisors (see below), whose sum is σ = 225321954635712. Its totient is φ = 215080047606732.

The previous prime is 220201001121161. The next prime is 220201001121223. The reversal of 220201001121221 is 122121100102022.

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 220201001121221 - 2¹⁴ = 220201001104837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 220201001121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220201001121223) 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, 2560476757181 + ... + 2560476757266.

It is an arithmetic number, because the mean of its divisors is an integer number (56330488658928).

Almost surely, 2^{220201001121221} is an apocalyptic number.

It is an amenable number.

220201001121221 is a deficient number, since it is larger than the sum of its proper divisors (5120953514491).

220201001121221 is an equidigital number, since it uses as much as digits as its factorization.

220201001121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5120953514490.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 220201001121221 its reverse (122121100102022), we get a palindrome (342322101223243).

The spelling of 220201001121221 in words is "two hundred twenty trillion, two hundred one billion, one million, one hundred twenty-one thousand, two hundred twenty-one".