212404442 has 4 divisors (see below), whose sum is σ = 318606666. Its totient is φ = 106202220.

The previous prime is 212404429. The next prime is 212404447. The reversal of 212404442 is 244404212.

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., 196252081 + 16152361 = 14009^2 + 4019^2 .

It is not an unprimeable number, because it can be changed into a prime (212404447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53101109 + ... + 53101112.

Almost surely, 2^212404442 is an apocalyptic number.

212404442 is a deficient number, since it is larger than the sum of its proper divisors (106202224).

212404442 is a wasteful number, since it uses less digits than its factorization.

212404442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106202223.

The product of its (nonzero) digits is 2048, while the sum is 23.

The square root of 212404442 is about 14574.1017561975. The cubic root of 212404442 is about 596.6521340294.

Adding to 212404442 its reverse (244404212), we get a palindrome (456808654).

The spelling of 212404442 in words is "two hundred twelve million, four hundred four thousand, four hundred forty-two".