220100100021121 has 4 divisors (see below), whose sum is σ = 220100132765700. Its totient is φ = 220100067276544.

The previous prime is 220100100021089. The next prime is 220100100021127. The reversal of 220100100021121 is 121120001001022.

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 113480762980225 + 106619337040896 = 10652735^2 + 10325664^2 .

It is a cyclic number.

It is not a de Polignac number, because 220100100021121 - 2⁵ = 220100100021089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220100100021127) 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, 2200936 + ... + 21096073.

It is an arithmetic number, because the mean of its divisors is an integer number (55025033191425).

Almost surely, 2^{220100100021121} is an apocalyptic number.

It is an amenable number.

220100100021121 is a deficient number, since it is larger than the sum of its proper divisors (32744579).

220100100021121 is an equidigital number, since it uses as much as digits as its factorization.

220100100021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32744578.

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

Adding to 220100100021121 its reverse (121120001001022), we get a palindrome (341220101022143).

The spelling of 220100100021121 in words is "two hundred twenty trillion, one hundred billion, one hundred million, twenty-one thousand, one hundred twenty-one".