213203023444 has 6 divisors (see below), whose sum is σ = 373105291034. Its totient is φ = 106601511720.

The previous prime is 213203023441. The next prime is 213203023483. The reversal of 213203023444 is 444320302312.

It can be written as a sum of positive squares in only one way, i.e., 211243190544 + 1959832900 = 459612^2 + 44270^2 .

It is a super-2 number, since 2×213203023444² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213203023441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26650377927 + ... + 26650377934.

Almost surely, 2^213203023444 is an apocalyptic number.

It is an amenable number.

213203023444 is a deficient number, since it is larger than the sum of its proper divisors (159902267590).

213203023444 is a wasteful number, since it uses less digits than its factorization.

213203023444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53300755865 (or 53300755863 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 213203023444 its reverse (444320302312), we get a palindrome (657523325756).

The spelling of 213203023444 in words is "two hundred thirteen billion, two hundred three million, twenty-three thousand, four hundred forty-four".