212696622521 has 2 divisors, whose sum is σ = 212696622522. Its totient is φ = 212696622520.

The previous prime is 212696622503. The next prime is 212696622631. The reversal of 212696622521 is 125226696212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 184501175296 + 28195447225 = 429536^2 + 167915^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212696622521 is a prime.

It is not a weakly prime, because it can be changed into another prime (212696622821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106348311260 + 106348311261.

It is an arithmetic number, because the mean of its divisors is an integer number (106348311261).

Almost surely, 2^212696622521 is an apocalyptic number.

It is an amenable number.

212696622521 is a deficient number, since it is larger than the sum of its proper divisors (1).

212696622521 is an equidigital number, since it uses as much as digits as its factorization.

212696622521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 44.

The spelling of 212696622521 in words is "two hundred twelve billion, six hundred ninety-six million, six hundred twenty-two thousand, five hundred twenty-one".