211285442 has 4 divisors (see below), whose sum is σ = 316928166. Its totient is φ = 105642720.

The previous prime is 211285441. The next prime is 211285447. The reversal of 211285442 is 244582112.

211285442 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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., 173475241 + 37810201 = 13171^2 + 6149^2 .

It is a super-2 number, since 2×211285442² = 89283076002270728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211285441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52821359 + ... + 52821362.

Almost surely, 2^211285442 is an apocalyptic number.

211285442 is a deficient number, since it is larger than the sum of its proper divisors (105642724).

211285442 is a wasteful number, since it uses less digits than its factorization.

211285442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105642723.

The product of its digits is 5120, while the sum is 29.

The square root of 211285442 is about 14535.6610444795. The cubic root of 211285442 is about 595.6025175034.

The spelling of 211285442 in words is "two hundred eleven million, two hundred eighty-five thousand, four hundred forty-two".