212329081 has 4 divisors (see below), whose sum is σ = 212365732. Its totient is φ = 212292432.

The previous prime is 212329067. The next prime is 212329111. The reversal of 212329081 is 180923212.

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 194351481 + 17977600 = 13941^2 + 4240^2 .

It is a cyclic number.

It is not a de Polignac number, because 212329081 - 2⁵ = 212329049 is a prime.

It is a super-2 number, since 2×212329081² = 90167277276609122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212329021) 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, 7506 + ... + 21931.

It is an arithmetic number, because the mean of its divisors is an integer number (53091433).

Almost surely, 2^212329081 is an apocalyptic number.

It is an amenable number.

212329081 is a deficient number, since it is larger than the sum of its proper divisors (36651).

212329081 is an equidigital number, since it uses as much as digits as its factorization.

212329081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36650.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 212329081 is about 14571.5160844711. The cubic root of 212329081 is about 596.5815617133.

The spelling of 212329081 in words is "two hundred twelve million, three hundred twenty-nine thousand, eighty-one".