213220244 has 6 divisors (see below), whose sum is σ = 373135434. Its totient is φ = 106610120.

The previous prime is 213220243. The next prime is 213220253. The reversal of 213220244 is 442022312.

It can be written as a sum of positive squares in only one way, i.e., 195664144 + 17556100 = 13988^2 + 4190^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213220243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26652527 + ... + 26652534.

It is an arithmetic number, because the mean of its divisors is an integer number (62189239).

Almost surely, 2^213220244 is an apocalyptic number.

It is an amenable number.

213220244 is a deficient number, since it is larger than the sum of its proper divisors (159915190).

213220244 is a wasteful number, since it uses less digits than its factorization.

213220244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53305065 (or 53305063 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 213220244 is about 14602.0630049319. The cubic root of 213220244 is about 597.4150310714.

Adding to 213220244 its reverse (442022312), we get a palindrome (655242556).

The spelling of 213220244 in words is "two hundred thirteen million, two hundred twenty thousand, two hundred forty-four".