213520520 has 16 divisors (see below), whose sum is σ = 480421260. Its totient is φ = 85408192.

The previous prime is 213520519. The next prime is 213520609. The reversal of 213520520 is 25025312.

It can be written as a sum of positive squares in 2 ways, for example, as 201810436 + 11710084 = 14206^2 + 3422^2 .

It is a super-2 number, since 2×213520520² = 91182024922140800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 213520492 and 213520501.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2668967 + ... + 2669046.

Almost surely, 2^213520520 is an apocalyptic number.

213520520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213520520 is an abundant number, since it is smaller than the sum of its proper divisors (266900740).

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

213520520 is a wasteful number, since it uses less digits than its factorization.

213520520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5338024 (or 5338020 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 213520520 is about 14612.3413592757. The cubic root of 213520520 is about 597.6953441216.

Adding to 213520520 its reverse (25025312), we get a palindrome (238545832).

The spelling of 213520520 in words is "two hundred thirteen million, five hundred twenty thousand, five hundred twenty".