212054215447 has 2 divisors, whose sum is σ = 212054215448. Its totient is φ = 212054215446.

The previous prime is 212054215423. The next prime is 212054215487. The reversal of 212054215447 is 744512450212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212054215447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212054215487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106027107723 + 106027107724.

It is an arithmetic number, because the mean of its divisors is an integer number (106027107724).

Almost surely, 2^212054215447 is an apocalyptic number.

212054215447 is a deficient number, since it is larger than the sum of its proper divisors (1).

212054215447 is an equidigital number, since it uses as much as digits as its factorization.

212054215447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 89600, while the sum is 37.

Adding to 212054215447 its reverse (744512450212), we get a palindrome (956566665659).

The spelling of 212054215447 in words is "two hundred twelve billion, fifty-four million, two hundred fifteen thousand, four hundred forty-seven".