212205042 has 32 divisors (see below), whose sum is σ = 538934400. Its totient is φ = 60629904.

The previous prime is 212205023. The next prime is 212205109. The reversal of 212205042 is 240502212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280317 + ... + 281072.

It is an arithmetic number, because the mean of its divisors is an integer number (16841700).

Almost surely, 2^212205042 is an apocalyptic number.

212205042 is an abundant number, since it is smaller than the sum of its proper divisors (326729358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212205042 is a wasteful number, since it uses less digits than its factorization.

212205042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561407 (or 561401 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 212205042 is about 14567.2592480535. The cubic root of 212205042 is about 596.4653681858.

Adding to 212205042 its reverse (240502212), we get a palindrome (452707254).

It can be divided in two parts, 21220 and 5042, that added together give a palindrome (26262).

The spelling of 212205042 in words is "two hundred twelve million, two hundred five thousand, forty-two".