12100204421 has 2 divisors, whose sum is σ = 12100204422. Its totient is φ = 12100204420.

The previous prime is 12100204381. The next prime is 12100204451. The reversal of 12100204421 is 12440200121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6640620100 + 5459584321 = 81490^2 + 73889^2 .

It is a cyclic number.

It is not a de Polignac number, because 12100204421 - 2¹⁸ = 12099942277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12100204421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12100204451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6050102210 + 6050102211.

It is an arithmetic number, because the mean of its divisors is an integer number (6050102211).

Almost surely, 2^12100204421 is an apocalyptic number.

It is an amenable number.

12100204421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12100204421 is an equidigital number, since it uses as much as digits as its factorization.

12100204421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 12100204421 its reverse (12440200121), we get a palindrome (24540404542).

The spelling of 12100204421 in words is "twelve billion, one hundred million, two hundred four thousand, four hundred twenty-one".