213100442 has 4 divisors (see below), whose sum is σ = 319650666. Its totient is φ = 106550220.

The previous prime is 213100403. The next prime is 213100453. The reversal of 213100442 is 244001312.

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., 199120321 + 13980121 = 14111^2 + 3739^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 213100442.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53275109 + ... + 53275112.

Almost surely, 2^213100442 is an apocalyptic number.

213100442 is a deficient number, since it is larger than the sum of its proper divisors (106550224).

213100442 is a wasteful number, since it uses less digits than its factorization.

213100442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106550223.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 213100442 is about 14597.9601999731. The cubic root of 213100442 is about 597.3031203025.

Adding to 213100442 its reverse (244001312), we get a palindrome (457101754).

The spelling of 213100442 in words is "two hundred thirteen million, one hundred thousand, four hundred forty-two".