213216442 has 16 divisors (see below), whose sum is σ = 342367200. Its totient is φ = 99284400.

The previous prime is 213216433. The next prime is 213216473. The reversal of 213216442 is 244612312.

It is a happy number.

It is a super-2 number, since 2×213216442² = 90922502278278728, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45309 + ... + 49792.

It is an arithmetic number, because the mean of its divisors is an integer number (21397950).

Almost surely, 2^213216442 is an apocalyptic number.

213216442 is a deficient number, since it is larger than the sum of its proper divisors (129150758).

213216442 is a wasteful number, since it uses less digits than its factorization.

213216442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95181.

The product of its digits is 2304, while the sum is 25.

The square root of 213216442 is about 14601.9328172677. The cubic root of 213216442 is about 597.4114801492.

Adding to 213216442 its reverse (244612312), we get a palindrome (457828754).

The spelling of 213216442 in words is "two hundred thirteen million, two hundred sixteen thousand, four hundred forty-two".