212065521 has 4 divisors (see below), whose sum is σ = 282754032. Its totient is φ = 141377012.

The previous prime is 212065501. The next prime is 212065523. The reversal of 212065521 is 125560212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212065521 - 2⁷ = 212065393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212065491 and 212065500.

It is not an unprimeable number, because it can be changed into a prime (212065523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35344251 + ... + 35344256.

It is an arithmetic number, because the mean of its divisors is an integer number (70688508).

Almost surely, 2^212065521 is an apocalyptic number.

It is an amenable number.

212065521 is a deficient number, since it is larger than the sum of its proper divisors (70688511).

212065521 is an equidigital number, since it uses as much as digits as its factorization.

212065521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70688510.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 212065521 is about 14562.4696051185. The cubic root of 212065521 is about 596.3346177742.

The spelling of 212065521 in words is "two hundred twelve million, sixty-five thousand, five hundred twenty-one".