213021423 has 36 divisors (see below), whose sum is σ = 325575432. Its totient is φ = 134191200.

The previous prime is 213021379. The next prime is 213021427. The reversal of 213021423 is 324120312.

It is not a de Polignac number, because 213021423 - 2¹⁶ = 212955887 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213021396 and 213021405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213021427) 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 35 ways as a sum of consecutive naturals, for example, 480640 + ... + 481082.

It is an arithmetic number, because the mean of its divisors is an integer number (9043762).

Almost surely, 2^213021423 is an apocalyptic number.

213021423 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

213021423 is a deficient number, since it is larger than the sum of its proper divisors (112554009).

213021423 is a wasteful number, since it uses less digits than its factorization.

213021423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596 (or 570 counting only the distinct ones).

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

The square root of 213021423 is about 14595.2534407594. The cubic root of 213021423 is about 597.2292832426.

Adding to 213021423 its reverse (324120312), we get a palindrome (537141735).

It can be divided in two parts, 213021 and 423, that added together give a square (213444 = 462²).

The spelling of 213021423 in words is "two hundred thirteen million, twenty-one thousand, four hundred twenty-three".