2220123421 has 2 divisors, whose sum is σ = 2220123422. Its totient is φ = 2220123420.

The previous prime is 2220123403. The next prime is 2220123431. The reversal of 2220123421 is 1243210222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2096357796 + 123765625 = 45786^2 + 11125^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220123421 - 2¹³ = 2220115229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2220123431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110061710 + 1110061711.

It is an arithmetic number, because the mean of its divisors is an integer number (1110061711).

Almost surely, 2^2220123421 is an apocalyptic number.

It is an amenable number.

2220123421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2220123421 is an equidigital number, since it uses as much as digits as its factorization.

2220123421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 2220123421 is about 47118.1856717765. The cubic root of 2220123421 is about 1304.5449245358.

Adding to 2220123421 its reverse (1243210222), we get a palindrome (3463333643).

The spelling of 2220123421 in words is "two billion, two hundred twenty million, one hundred twenty-three thousand, four hundred twenty-one".