213145442 has 8 divisors (see below), whose sum is σ = 320501100. Its totient is φ = 106311744.

The previous prime is 213145441. The next prime is 213145469. The reversal of 213145442 is 244541312.

213145442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 213130801 + 14641 = 14599^2 + 121^2 .

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

It is not an unprimeable number, because it can be changed into a prime (213145441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129467 + ... + 131102.

Almost surely, 2^213145442 is an apocalyptic number.

213145442 is a deficient number, since it is larger than the sum of its proper divisors (107355658).

213145442 is a wasteful number, since it uses less digits than its factorization.

213145442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260980.

The product of its digits is 3840, while the sum is 26.

The square root of 213145442 is about 14599.5014298434. The cubic root of 213145442 is about 597.3451611173.

Adding to 213145442 its reverse (244541312), we get a palindrome (457686754).

The spelling of 213145442 in words is "two hundred thirteen million, one hundred forty-five thousand, four hundred forty-two".