212204123447 has 2 divisors, whose sum is σ = 212204123448. Its totient is φ = 212204123446.

The previous prime is 212204123399. The next prime is 212204123479. The reversal of 212204123447 is 744321402212.

It is an a-pointer prime, because the next prime (212204123479) can be obtained adding 212204123447 to its sum of digits (32).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212204123447 - 2²⁰ = 212203074871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212204123147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106102061723 + 106102061724.

It is an arithmetic number, because the mean of its divisors is an integer number (106102061724).

Almost surely, 2^212204123447 is an apocalyptic number.

212204123447 is a deficient number, since it is larger than the sum of its proper divisors (1).

212204123447 is an equidigital number, since it uses as much as digits as its factorization.

212204123447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 32.

Adding to 212204123447 its reverse (744321402212), we get a palindrome (956525525659).

The spelling of 212204123447 in words is "two hundred twelve billion, two hundred four million, one hundred twenty-three thousand, four hundred forty-seven".