212705371517 has 4 divisors (see below), whose sum is σ = 212711172636. Its totient is φ = 212699570400.

The previous prime is 212705371429. The next prime is 212705371537. The reversal of 212705371517 is 715173507212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8714035801 + 203991335716 = 93349^2 + 451654^2 .

It is a cyclic number.

It is not a de Polignac number, because 212705371517 - 2¹⁴ = 212705355133 is a prime.

It is a super-3 number, since 3×212705371517³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212705371537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2845208 + ... + 2919009.

It is an arithmetic number, because the mean of its divisors is an integer number (53177793159).

Almost surely, 2^212705371517 is an apocalyptic number.

It is an amenable number.

212705371517 is a deficient number, since it is larger than the sum of its proper divisors (5801119).

212705371517 is an equidigital number, since it uses as much as digits as its factorization.

212705371517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5801118.

The product of its (nonzero) digits is 102900, while the sum is 41.

Adding to 212705371517 its reverse (715173507212), we get a palindrome (927878878729).

The spelling of 212705371517 in words is "two hundred twelve billion, seven hundred five million, three hundred seventy-one thousand, five hundred seventeen".