213344020521 has 24 divisors (see below), whose sum is σ = 324403453920. Its totient is φ = 134734980096.

The previous prime is 213344020451. The next prime is 213344020523. The reversal of 213344020521 is 125020443312.

213344020521 is a `hidden beast` number, since 2 + 13 + 3 + 440 + 205 + 2 + 1 = 666.

It is not a de Polignac number, because 213344020521 - 2⁹ = 213344020009 is a prime.

It is a super-2 number, since 2×213344020521² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213344020523) 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 23 ways as a sum of consecutive naturals, for example, 3626286 + ... + 3684648.

It is an arithmetic number, because the mean of its divisors is an integer number (13516810580).

Almost surely, 2^213344020521 is an apocalyptic number.

It is an amenable number.

213344020521 is a deficient number, since it is larger than the sum of its proper divisors (111059433399).

213344020521 is a wasteful number, since it uses less digits than its factorization.

213344020521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79765 (or 79762 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 213344020521 its reverse (125020443312), we get a palindrome (338364463833).

The spelling of 213344020521 in words is "two hundred thirteen billion, three hundred forty-four million, twenty thousand, five hundred twenty-one".