212106706681 has 4 divisors (see below), whose sum is σ = 212110665552. Its totient is φ = 212102747812.

The previous prime is 212106706667. The next prime is 212106706697. The reversal of 212106706681 is 186607601212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212106706681 - 2¹¹ = 212106704633 is a prime.

It is a super-2 number, since 2×212106706681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212106706631) 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, 1897951 + ... + 2006596.

It is an arithmetic number, because the mean of its divisors is an integer number (53027666388).

Almost surely, 2^212106706681 is an apocalyptic number.

It is an amenable number.

212106706681 is a deficient number, since it is larger than the sum of its proper divisors (3958871).

212106706681 is an equidigital number, since it uses as much as digits as its factorization.

212106706681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3958870.

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 212106706681 in words is "two hundred twelve billion, one hundred six million, seven hundred six thousand, six hundred eighty-one".