2220431021 has 2 divisors, whose sum is σ = 2220431022. Its totient is φ = 2220431020.

The previous prime is 2220430967. The next prime is 2220431039. The reversal of 2220431021 is 1201340222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1428008521 + 792422500 = 37789^2 + 28150^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220431021 - 2¹⁸ = 2220168877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2220431071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110215510 + 1110215511.

It is an arithmetic number, because the mean of its divisors is an integer number (1110215511).

Almost surely, 2^2220431021 is an apocalyptic number.

It is an amenable number.

2220431021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2220431021 is an equidigital number, since it uses as much as digits as its factorization.

2220431021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2220431021 is about 47121.4496911969. The cubic root of 2220431021 is about 1304.6051703587.

Adding to 2220431021 its reverse (1201340222), we get a palindrome (3421771243).

The spelling of 2220431021 in words is "two billion, two hundred twenty million, four hundred thirty-one thousand, twenty-one".