12221020200421 has 2 divisors, whose sum is σ = 12221020200422. Its totient is φ = 12221020200420.

The previous prime is 12221020200413. The next prime is 12221020200439. The reversal of 12221020200421 is 12400202012221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12052110708225 + 168909492196 = 3471615^2 + 410986^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221020200421 - 2³ = 12221020200413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12221020200491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110510100210 + 6110510100211.

It is an arithmetic number, because the mean of its divisors is an integer number (6110510100211).

Almost surely, 2^{12221020200421} is an apocalyptic number.

It is an amenable number.

12221020200421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221020200421 is an equidigital number, since it uses as much as digits as its factorization.

12221020200421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 12221020200421 its reverse (12400202012221), we get a palindrome (24621222212642).

The spelling of 12221020200421 in words is "twelve trillion, two hundred twenty-one billion, twenty million, two hundred thousand, four hundred twenty-one".