213031224 has 72 divisors (see below), whose sum is σ = 671168160. Its totient is φ = 60865056.

The previous prime is 213031223. The next prime is 213031271. The reversal of 213031224 is 422130312.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 213031197 and 213031206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213031223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 26664 + ... + 33719.

It is an arithmetic number, because the mean of its divisors is an integer number (9321780).

Almost surely, 2^213031224 is an apocalyptic number.

213031224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

213031224 is an abundant number, since it is smaller than the sum of its proper divisors (458136936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213031224 is a wasteful number, since it uses less digits than its factorization.

213031224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60409 (or 60395 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 213031224 is about 14595.5891967402. The cubic root of 213031224 is about 597.2384425005.

Adding to 213031224 its reverse (422130312), we get a palindrome (635161536).

The spelling of 213031224 in words is "two hundred thirteen million, thirty-one thousand, two hundred twenty-four".