220021100121 has 4 divisors (see below), whose sum is σ = 293361466832. Its totient is φ = 146680733412.

The previous prime is 220021100099. The next prime is 220021100149. The reversal of 220021100121 is 121001120022.

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 not a de Polignac number, because 220021100121 - 2⁷ = 220021099993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220021100097 and 220021100106.

It is not an unprimeable number, because it can be changed into a prime (220021100161) 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, 36670183351 + ... + 36670183356.

It is an arithmetic number, because the mean of its divisors is an integer number (73340366708).

Almost surely, 2^220021100121 is an apocalyptic number.

It is an amenable number.

220021100121 is a deficient number, since it is larger than the sum of its proper divisors (73340366711).

220021100121 is an equidigital number, since it uses as much as digits as its factorization.

220021100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73340366710.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 220021100121 its reverse (121001120022), we get a palindrome (341022220143).

The spelling of 220021100121 in words is "two hundred twenty billion, twenty-one million, one hundred thousand, one hundred twenty-one".