12220432421 has 2 divisors, whose sum is σ = 12220432422. Its totient is φ = 12220432420.

The previous prime is 12220432403. The next prime is 12220432453. The reversal of 12220432421 is 12423402221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11165092225 + 1055340196 = 105665^2 + 32486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12220432421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12220432321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110216210 + 6110216211.

It is an arithmetic number, because the mean of its divisors is an integer number (6110216211).

Almost surely, 2^12220432421 is an apocalyptic number.

It is an amenable number.

12220432421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12220432421 is an equidigital number, since it uses as much as digits as its factorization.

12220432421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 12220432421 its reverse (12423402221), we get a palindrome (24643834642).

The spelling of 12220432421 in words is "twelve billion, two hundred twenty million, four hundred thirty-two thousand, four hundred twenty-one".