220000210001221 has 4 divisors (see below), whose sum is σ = 236923303078252. Its totient is φ = 203077116924192.

The previous prime is 220000210001179. The next prime is 220000210001359. The reversal of 220000210001221 is 122100012000022.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24277004208900 + 195723205792321 = 4927170^2 + 13990111^2 .

It is a cyclic number.

It is not a de Polignac number, because 220000210001221 - 2⁷ = 220000210001093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 16923093077017 = 220000210001221 / (2 + 2 + 0 + 0 + 0 + 0 + 2 + 1 + 0 + 0 + 0 + 1 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220000210001821) 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, 8461546538496 + ... + 8461546538521.

It is an arithmetic number, because the mean of its divisors is an integer number (59230825769563).

Almost surely, 2^{220000210001221} is an apocalyptic number.

It is an amenable number.

220000210001221 is a deficient number, since it is larger than the sum of its proper divisors (16923093077031).

220000210001221 is a wasteful number, since it uses less digits than its factorization.

220000210001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16923093077030.

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

Adding to 220000210001221 its reverse (122100012000022), we get a palindrome (342100222001243).

The spelling of 220000210001221 in words is "two hundred twenty trillion, two hundred ten million, one thousand, two hundred twenty-one".