212101442 has 32 divisors (see below), whose sum is σ = 382454784. Its totient is φ = 86299200.

The previous prime is 212101441. The next prime is 212101451. The reversal of 212101442 is 244101212.

It is a self number, because there is not a number n which added to its sum of digits gives 212101442.

It is not an unprimeable number, because it can be changed into a prime (212101441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18392 + ... + 27612.

It is an arithmetic number, because the mean of its divisors is an integer number (11951712).

Almost surely, 2^212101442 is an apocalyptic number.

212101442 is a deficient number, since it is larger than the sum of its proper divisors (170353342).

212101442 is a wasteful number, since it uses less digits than its factorization.

212101442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9314.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 212101442 is about 14563.7028945251. The cubic root of 212101442 is about 596.3682861838.

Adding to 212101442 its reverse (244101212), we get a palindrome (456202654).

The spelling of 212101442 in words is "two hundred twelve million, one hundred one thousand, four hundred forty-two".