212881085 has 4 divisors (see below), whose sum is σ = 255457308. Its totient is φ = 170304864.

The previous prime is 212881057. The next prime is 212881087. The reversal of 212881085 is 580188212.

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 133564249 + 79316836 = 11557^2 + 8906^2 .

It is a cyclic number.

It is not a de Polignac number, because 212881085 - 2¹⁶ = 212815549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212881087) 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, 21288104 + ... + 21288113.

It is an arithmetic number, because the mean of its divisors is an integer number (63864327).

Almost surely, 2^212881085 is an apocalyptic number.

It is an amenable number.

212881085 is a deficient number, since it is larger than the sum of its proper divisors (42576223).

212881085 is an equidigital number, since it uses as much as digits as its factorization.

212881085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42576222.

The product of its (nonzero) digits is 10240, while the sum is 35.

The square root of 212881085 is about 14590.4449897870. Note that the first 3 decimals coincide. The cubic root of 212881085 is about 597.0981033606.

The spelling of 212881085 in words is "two hundred twelve million, eight hundred eighty-one thousand, eighty-five".