212087851834 has 4 divisors (see below), whose sum is σ = 318131777754. Its totient is φ = 106043925916.

The previous prime is 212087851831. The next prime is 212087851849. The reversal of 212087851834 is 438158780212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 201345151225 + 10742700609 = 448715^2 + 103647^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (212087851831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53021962957 + ... + 53021962960.

Almost surely, 2^212087851834 is an apocalyptic number.

212087851834 is a deficient number, since it is larger than the sum of its proper divisors (106043925920).

212087851834 is a wasteful number, since it uses less digits than its factorization.

212087851834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106043925919.

The product of its (nonzero) digits is 860160, while the sum is 49.

It can be divided in two parts, 2120878 and 51834, that added together give a palindrome (2172712).

The spelling of 212087851834 in words is "two hundred twelve billion, eighty-seven million, eight hundred fifty-one thousand, eight hundred thirty-four".