2220310021 has 4 divisors (see below), whose sum is σ = 2231814412. Its totient is φ = 2208805632.

The previous prime is 2220310013. The next prime is 2220310039. The reversal of 2220310021 is 1200130222.

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 220968225 + 1999341796 = 14865^2 + 44714^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220310021 - 2³ = 2220310013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2220309983 and 2220310010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220310921) 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, 5751906 + ... + 5752291.

It is an arithmetic number, because the mean of its divisors is an integer number (557953603).

Almost surely, 2^2220310021 is an apocalyptic number.

It is an amenable number.

2220310021 is a deficient number, since it is larger than the sum of its proper divisors (11504391).

2220310021 is a wasteful number, since it uses less digits than its factorization.

2220310021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11504390.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 2220310021 is about 47120.1657573485. The cubic root of 2220310021 is about 1304.5814722431.

Adding to 2220310021 its reverse (1200130222), we get a palindrome (3420440243).

The spelling of 2220310021 in words is "two billion, two hundred twenty million, three hundred ten thousand, twenty-one".