212911081 has 4 divisors (see below), whose sum is σ = 217441152. Its totient is φ = 208381012.

The previous prime is 212911063. The next prime is 212911109. The reversal of 212911081 is 180119212.

212911081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212911081 - 2¹³ = 212902889 is a prime.

It is a super-3 number, since 3×212911081³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212911021) 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, 2264965 + ... + 2265058.

It is an arithmetic number, because the mean of its divisors is an integer number (54360288).

Almost surely, 2^212911081 is an apocalyptic number.

It is an amenable number.

212911081 is a deficient number, since it is larger than the sum of its proper divisors (4530071).

212911081 is an equidigital number, since it uses as much as digits as its factorization.

212911081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4530070.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 212911081 is about 14591.4728865869. The cubic root of 212911081 is about 597.1261467376.

The spelling of 212911081 in words is "two hundred twelve million, nine hundred eleven thousand, eighty-one".