212123111977547 has 2 divisors, whose sum is σ = 212123111977548. Its totient is φ = 212123111977546.

The previous prime is 212123111977459. The next prime is 212123111977549. The reversal of 212123111977547 is 745779111321212.

212123111977547 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212123111977547 - 2⁴⁶ = 141754367799883 is a prime.

Together with 212123111977549, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (212123111977549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106061555988773 + 106061555988774.

It is an arithmetic number, because the mean of its divisors is an integer number (106061555988774).

Almost surely, 2^{212123111977547} is an apocalyptic number.

212123111977547 is a deficient number, since it is larger than the sum of its proper divisors (1).

212123111977547 is an equidigital number, since it uses as much as digits as its factorization.

212123111977547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1481760, while the sum is 53.

The spelling of 212123111977547 in words is "two hundred twelve trillion, one hundred twenty-three billion, one hundred eleven million, nine hundred seventy-seven thousand, five hundred forty-seven".