212021113517 has 2 divisors, whose sum is σ = 212021113518. Its totient is φ = 212021113516.

The previous prime is 212021113481. The next prime is 212021113541. The reversal of 212021113517 is 715311120212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194070205156 + 17950908361 = 440534^2 + 133981^2 .

It is a cyclic number.

It is not a de Polignac number, because 212021113517 - 2⁸ = 212021113261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212021113597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010556758 + 106010556759.

It is an arithmetic number, because the mean of its divisors is an integer number (106010556759).

Almost surely, 2^212021113517 is an apocalyptic number.

It is an amenable number.

212021113517 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021113517 is an equidigital number, since it uses as much as digits as its factorization.

212021113517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 26.

Adding to 212021113517 its reverse (715311120212), we get a palindrome (927332233729).

The spelling of 212021113517 in words is "two hundred twelve billion, twenty-one million, one hundred thirteen thousand, five hundred seventeen".