220001011100221 has 4 divisors (see below), whose sum is σ = 236924165800252. Its totient is φ = 203077856400192.

The previous prime is 220001011100191. The next prime is 220001011100383. The reversal of 220001011100221 is 122001110100022.

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 141324306240100 + 78676704860121 = 11887990^2 + 8869989^2 .

It is a cyclic number.

It is not a de Polignac number, because 220001011100221 - 2⁴⁷ = 79263522744893 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: 16923154700017 = 220001011100221 / (2 + 2 + 0 + 0 + 0 + 1 + 0 + 1 + 1 + 1 + 0 + 0 + 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 (220001011100021) 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, 8461577349996 + ... + 8461577350021.

It is an arithmetic number, because the mean of its divisors is an integer number (59231041450063).

Almost surely, 2^{220001011100221} is an apocalyptic number.

It is an amenable number.

220001011100221 is a deficient number, since it is larger than the sum of its proper divisors (16923154700031).

220001011100221 is a wasteful number, since it uses less digits than its factorization.

220001011100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16923154700030.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 220001011100221 its reverse (122001110100022), we get a palindrome (342002121200243).

The spelling of 220001011100221 in words is "two hundred twenty trillion, one billion, eleven million, one hundred thousand, two hundred twenty-one".