213240521 has 16 divisors (see below), whose sum is σ = 240240000. Its totient is φ = 187799040.

The previous prime is 213240497. The next prime is 213240523. The reversal of 213240521 is 125042312.

It is not a de Polignac number, because 213240521 - 2²² = 209046217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213240493 and 213240502.

It is not an unprimeable number, because it can be changed into a prime (213240523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170105 + ... + 171353.

It is an arithmetic number, because the mean of its divisors is an integer number (15015000).

Almost surely, 2^213240521 is an apocalyptic number.

It is an amenable number.

213240521 is a deficient number, since it is larger than the sum of its proper divisors (26999479).

213240521 is a wasteful number, since it uses less digits than its factorization.

213240521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1856.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 213240521 is about 14602.7573081251. The cubic root of 213240521 is about 597.4339682986.

Adding to 213240521 its reverse (125042312), we get a palindrome (338282833).

The spelling of 213240521 in words is "two hundred thirteen million, two hundred forty thousand, five hundred twenty-one".