213240520 has 32 divisors (see below), whose sum is σ = 508015800. Its totient is φ = 80278528.

The previous prime is 213240497. The next prime is 213240523. The reversal of 213240520 is 25042312.

213240520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 185340996 + 27899524 = 13614^2 + 5282^2 .

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 7 ways as a sum of consecutive naturals, for example, 156115 + ... + 157474.

Almost surely, 2^213240520 is an apocalyptic number.

213240520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213240520 is an abundant number, since it is smaller than the sum of its proper divisors (294775280).

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

213240520 is a wasteful number, since it uses less digits than its factorization.

213240520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313617 (or 313613 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 213240520 is about 14602.7572738850. The cubic root of 213240520 is about 597.4339673647.

Adding to 213240520 its reverse (25042312), we get a palindrome (238282832).

The spelling of 213240520 in words is "two hundred thirteen million, two hundred forty thousand, five hundred twenty".