213344021 has 8 divisors (see below), whose sum is σ = 242858304. Its totient is φ = 185516320.

The previous prime is 213343997. The next prime is 213344029. The reversal of 213344021 is 120443312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 213344021 - 2¹⁸ = 213081877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213343984 and 213344002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213344029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 421376 + ... + 421881.

It is an arithmetic number, because the mean of its divisors is an integer number (30357288).

Almost surely, 2^213344021 is an apocalyptic number.

It is an amenable number.

213344021 is a deficient number, since it is larger than the sum of its proper divisors (29514283).

213344021 is a wasteful number, since it uses less digits than its factorization.

213344021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843291.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 213344021 is about 14606.3007294797. The cubic root of 213344021 is about 597.5306109910.

Adding to 213344021 its reverse (120443312), we get a palindrome (333787333).

The spelling of 213344021 in words is "two hundred thirteen million, three hundred forty-four thousand, twenty-one".