212420521 has 2 divisors, whose sum is σ = 212420522. Its totient is φ = 212420520.

The previous prime is 212420519. The next prime is 212420543. The reversal of 212420521 is 125024212.

212420521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210830400 + 1590121 = 14520^2 + 1261^2 .

It is a cyclic number.

It is not a de Polignac number, because 212420521 - 2¹ = 212420519 is a prime.

It is a super-2 number, since 2×212420521² = 90244955483822882, which contains 22 as substring.

Together with 212420519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (212420501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106210260 + 106210261.

It is an arithmetic number, because the mean of its divisors is an integer number (106210261).

Almost surely, 2^212420521 is an apocalyptic number.

It is an amenable number.

212420521 is a deficient number, since it is larger than the sum of its proper divisors (1).

212420521 is an equidigital number, since it uses as much as digits as its factorization.

212420521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 212420521 is about 14574.6533749520. The cubic root of 212420521 is about 596.6671891565.

Adding to 212420521 its reverse (125024212), we get a palindrome (337444733).

The spelling of 212420521 in words is "two hundred twelve million, four hundred twenty thousand, five hundred twenty-one".