212112521 has 2 divisors, whose sum is σ = 212112522. Its totient is φ = 212112520.

The previous prime is 212112503. The next prime is 212112541. The reversal of 212112521 is 125211212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128572921 + 83539600 = 11339^2 + 9140^2 .

It is a cyclic number.

It is not a de Polignac number, because 212112521 - 2²⁶ = 145003657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212112521.

It is not a weakly prime, because it can be changed into another prime (212112541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106056260 + 106056261.

It is an arithmetic number, because the mean of its divisors is an integer number (106056261).

Almost surely, 2^212112521 is an apocalyptic number.

It is an amenable number.

212112521 is a deficient number, since it is larger than the sum of its proper divisors (1).

212112521 is an equidigital number, since it uses as much as digits as its factorization.

212112521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80, while the sum is 17.

The square root of 212112521 is about 14564.0832529892. The cubic root of 212112521 is about 596.3786696574.

Adding to 212112521 its reverse (125211212), we get a palindrome (337323733).

It can be divided in two parts, 21211 and 2521, that added together give a palindrome (23732).

The spelling of 212112521 in words is "two hundred twelve million, one hundred twelve thousand, five hundred twenty-one".