212212521 has 8 divisors (see below), whose sum is σ = 314388960. Its totient is φ = 141474996.

The previous prime is 212212489. The next prime is 212212523. The reversal of 212212521 is 125212212.

It is not a de Polignac number, because 212212521 - 2⁵ = 212212489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212212494 and 212212503.

It is not an unprimeable number, because it can be changed into a prime (212212523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3929835 + ... + 3929888.

It is an arithmetic number, because the mean of its divisors is an integer number (39298620).

Almost surely, 2^212212521 is an apocalyptic number.

It is an amenable number.

212212521 is a deficient number, since it is larger than the sum of its proper divisors (102176439).

212212521 is an equidigital number, since it uses as much as digits as its factorization.

212212521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7859732 (or 7859726 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 212212521 is about 14567.5159515959. The cubic root of 212212521 is about 596.4723754212.

Adding to 212212521 its reverse (125212212), we get a palindrome (337424733).

The spelling of 212212521 in words is "two hundred twelve million, two hundred twelve thousand, five hundred twenty-one".