212454025517 has 2 divisors, whose sum is σ = 212454025518. Its totient is φ = 212454025516.

The previous prime is 212454025481. The next prime is 212454025547. The reversal of 212454025517 is 715520454212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129966739081 + 82487286436 = 360509^2 + 287206^2 .

It is a cyclic number.

It is not a de Polignac number, because 212454025517 - 2⁶ = 212454025453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212454025547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106227012758 + 106227012759.

It is an arithmetic number, because the mean of its divisors is an integer number (106227012759).

Almost surely, 2^212454025517 is an apocalyptic number.

It is an amenable number.

212454025517 is a deficient number, since it is larger than the sum of its proper divisors (1).

212454025517 is an equidigital number, since it uses as much as digits as its factorization.

212454025517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112000, while the sum is 38.

Adding to 212454025517 its reverse (715520454212), we get a palindrome (927974479729).

The spelling of 212454025517 in words is "two hundred twelve billion, four hundred fifty-four million, twenty-five thousand, five hundred seventeen".