2220020321 has 4 divisors (see below), whose sum is σ = 2220154644. Its totient is φ = 2219886000.

The previous prime is 2220020269. The next prime is 2220020323. The reversal of 2220020321 is 1230200222.

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 1899216400 + 320803921 = 43580^2 + 17911^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220020321 - 2¹⁰ = 2220019297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2220020296 and 2220020305.

It is not an unprimeable number, because it can be changed into a prime (2220020323) 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, 38210 + ... + 76811.

It is an arithmetic number, because the mean of its divisors is an integer number (555038661).

Almost surely, 2^2220020321 is an apocalyptic number.

It is an amenable number.

2220020321 is a deficient number, since it is larger than the sum of its proper divisors (134323).

2220020321 is a wasteful number, since it uses less digits than its factorization.

2220020321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134322.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 2220020321 is about 47117.0916016683. The cubic root of 2220020321 is about 1304.5247303636.

Adding to 2220020321 its reverse (1230200222), we get a palindrome (3450220543).

The spelling of 2220020321 in words is "two billion, two hundred twenty million, twenty thousand, three hundred twenty-one".