220211102212121 has 4 divisors (see below), whose sum is σ = 220211173963044. Its totient is φ = 220211030461200.

The previous prime is 220211102212081. The next prime is 220211102212169. The reversal of 220211102212121 is 121212201112022.

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 85178335682521 + 135032766529600 = 9229211^2 + 11620360^2 .

It is a cyclic number.

It is not a de Polignac number, because 220211102212121 - 2³⁰ = 220210028470297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220211102212093 and 220211102212102.

It is not an unprimeable number, because it can be changed into a prime (220211102212921) 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, 31055990 + ... + 37481951.

It is an arithmetic number, because the mean of its divisors is an integer number (55052793490761).

Almost surely, 2^{220211102212121} is an apocalyptic number.

It is an amenable number.

220211102212121 is a deficient number, since it is larger than the sum of its proper divisors (71750923).

220211102212121 is an equidigital number, since it uses as much as digits as its factorization.

220211102212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71750922.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 220211102212121 its reverse (121212201112022), we get a palindrome (341423303324143).

The spelling of 220211102212121 in words is "two hundred twenty trillion, two hundred eleven billion, one hundred two million, two hundred twelve thousand, one hundred twenty-one".