211878842 has 72 divisors (see below), whose sum is σ = 401069556. Its totient is φ = 83655936.

The previous prime is 211878833. The next prime is 211878847. The reversal of 211878842 is 248878112.

211878842 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 202521361 + 9357481 = 14231^2 + 3059^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 211878842.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211878847) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1874978 + ... + 1875090.

Almost surely, 2^211878842 is an apocalyptic number.

211878842 is a deficient number, since it is larger than the sum of its proper divisors (189190714).

211878842 is a wasteful number, since it uses less digits than its factorization.

211878842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 194 counting only the distinct ones).

The product of its digits is 57344, while the sum is 41.

The square root of 211878842 is about 14556.0586011461. The cubic root of 211878842 is about 596.1595840848.

The spelling of 211878842 in words is "two hundred eleven million, eight hundred seventy-eight thousand, eight hundred forty-two".