213122424 has 16 divisors (see below), whose sum is σ = 532806120. Its totient is φ = 71040800.

The previous prime is 213122389. The next prime is 213122431. The reversal of 213122424 is 424221312.

It is a super-2 number, since 2×213122424² = 90842335223271552, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 213122424.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4440027 + ... + 4440074.

Almost surely, 2^213122424 is an apocalyptic number.

213122424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

213122424 is an abundant number, since it is smaller than the sum of its proper divisors (319683696).

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

213122424 is a wasteful number, since it uses less digits than its factorization.

213122424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8880110 (or 8880106 counting only the distinct ones).

The product of its digits is 768, while the sum is 21.

The square root of 213122424 is about 14598.7130939682. The cubic root of 213122424 is about 597.3236575127.

Adding to 213122424 its reverse (424221312), we get a palindrome (637343736).

The spelling of 213122424 in words is "two hundred thirteen million, one hundred twenty-two thousand, four hundred twenty-four".