2220121021 has 4 divisors (see below), whose sum is σ = 2223828000. Its totient is φ = 2216414044.

The previous prime is 2220120997. The next prime is 2220121039. The reversal of 2220121021 is 1201210222.

It is a happy number.

2220121021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1201210222 = 2 ⋅600605111.

It is a cyclic number.

It is not a de Polignac number, because 2220121021 - 2⁵ = 2220120989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2220120992 and 2220121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220121051) 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, 1852591 + ... + 1853788.

It is an arithmetic number, because the mean of its divisors is an integer number (555957000).

Almost surely, 2^2220121021 is an apocalyptic number.

It is an amenable number.

2220121021 is a deficient number, since it is larger than the sum of its proper divisors (3706979).

2220121021 is an equidigital number, since it uses as much as digits as its factorization.

2220121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3706978.

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

The square root of 2220121021 is about 47118.1602038959. The cubic root of 2220121021 is about 1304.5444544554.

Adding to 2220121021 its reverse (1201210222), we get a palindrome (3421331243).

The spelling of 2220121021 in words is "two billion, two hundred twenty million, one hundred twenty-one thousand, twenty-one".