212081863 has 16 divisors (see below), whose sum is σ = 247164736. Its totient is φ = 178225920.

The previous prime is 212081861. The next prime is 212081879. The reversal of 212081863 is 368180212.

It is a cyclic number.

It is not a de Polignac number, because 212081863 - 2¹ = 212081861 is a prime.

It is a super-2 number, since 2×212081863² = 89957433227101538, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212081861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91345 + ... + 93637.

It is an arithmetic number, because the mean of its divisors is an integer number (15447796).

Almost surely, 2^212081863 is an apocalyptic number.

212081863 is a deficient number, since it is larger than the sum of its proper divisors (35082873).

212081863 is a wasteful number, since it uses less digits than its factorization.

212081863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2554.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 212081863 is about 14563.0306941927. The cubic root of 212081863 is about 596.3499354458.

The spelling of 212081863 in words is "two hundred twelve million, eighty-one thousand, eight hundred sixty-three".