212164116481 has 4 divisors (see below), whose sum is σ = 212205568000. Its totient is φ = 212122664964.

The previous prime is 212164116457. The next prime is 212164116497. The reversal of 212164116481 is 184611461212.

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 a de Polignac number, because none of the positive numbers 2^k-212164116481 is a prime.

It is a super-2 number, since 2×212164116481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212164116481.

It is not an unprimeable number, because it can be changed into a prime (212164119481) 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, 20718081 + ... + 20728318.

It is an arithmetic number, because the mean of its divisors is an integer number (53051392000).

Almost surely, 2^212164116481 is an apocalyptic number.

It is an amenable number.

212164116481 is a deficient number, since it is larger than the sum of its proper divisors (41451519).

212164116481 is an equidigital number, since it uses as much as digits as its factorization.

212164116481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41451518.

The product of its digits is 18432, while the sum is 37.

Adding to 212164116481 its reverse (184611461212), we get a palindrome (396775577693).

The spelling of 212164116481 in words is "two hundred twelve billion, one hundred sixty-four million, one hundred sixteen thousand, four hundred eighty-one".