212120131247 has 2 divisors, whose sum is σ = 212120131248. Its totient is φ = 212120131246.

The previous prime is 212120131121. The next prime is 212120131253. The reversal of 212120131247 is 742131021212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212120131247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212120136247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106060065623 + 106060065624.

It is an arithmetic number, because the mean of its divisors is an integer number (106060065624).

Almost surely, 2^212120131247 is an apocalyptic number.

212120131247 is a deficient number, since it is larger than the sum of its proper divisors (1).

212120131247 is an equidigital number, since it uses as much as digits as its factorization.

212120131247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

Adding to 212120131247 its reverse (742131021212), we get a palindrome (954251152459).

The spelling of 212120131247 in words is "two hundred twelve billion, one hundred twenty million, one hundred thirty-one thousand, two hundred forty-seven".