212405042 has 8 divisors (see below), whose sum is σ = 319511196. Its totient is φ = 105901312.

The previous prime is 212405033. The next prime is 212405093. The reversal of 212405042 is 240504212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 180606721 + 31798321 = 13439^2 + 5639^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149723 + ... + 151134.

Almost surely, 2^212405042 is an apocalyptic number.

212405042 is a deficient number, since it is larger than the sum of its proper divisors (107106154).

212405042 is a wasteful number, since it uses less digits than its factorization.

212405042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301212.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 212405042 is about 14574.1223406420. The cubic root of 212405042 is about 596.6526958365.

Adding to 212405042 its reverse (240504212), we get a palindrome (452909254).

The spelling of 212405042 in words is "two hundred twelve million, four hundred five thousand, forty-two".