213421536 has 72 divisors (see below), whose sum is σ = 642633264. Its totient is φ = 66954240.

The previous prime is 213421529. The next prime is 213421543. The reversal of 213421536 is 635124312.

It is an interprime number because it is at equal distance from previous prime (213421529) and next prime (213421543).

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

It is a super-3 number, since 3×213421536³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 16900 + ... + 26691.

It is an arithmetic number, because the mean of its divisors is an integer number (8925462).

Almost surely, 2^213421536 is an apocalyptic number.

It is an amenable number.

213421536 is an abundant number, since it is smaller than the sum of its proper divisors (429211728).

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

213421536 is a wasteful number, since it uses less digits than its factorization.

213421536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43624 (or 43613 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 213421536 is about 14608.9539666603. The cubic root of 213421536 is about 597.6029698298.

Adding to 213421536 its reverse (635124312), we get a palindrome (848545848).

The spelling of 213421536 in words is "two hundred thirteen million, four hundred twenty-one thousand, five hundred thirty-six".