212521520 has 40 divisors (see below), whose sum is σ = 503445456. Its totient is φ = 83403008.

The previous prime is 212521513. The next prime is 212521549. The reversal of 212521520 is 25125212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×212521520² = 90330792926220800, 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 = 212521492 and 212521501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20822 + ... + 29301.

Almost surely, 2^212521520 is an apocalyptic number.

212521520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212521520 is an abundant number, since it is smaller than the sum of its proper divisors (290923936).

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

212521520 is a wasteful number, since it uses less digits than its factorization.

212521520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50189 (or 50183 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 212521520 is about 14578.1178483369. The cubic root of 212521520 is about 596.7617394079.

Adding to 212521520 its reverse (25125212), we get a palindrome (237646732).

The spelling of 212521520 in words is "two hundred twelve million, five hundred twenty-one thousand, five hundred twenty".