212120401 has 2 divisors, whose sum is σ = 212120402. Its totient is φ = 212120400.

The previous prime is 212120393. The next prime is 212120411. The reversal of 212120401 is 104021212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124211025 + 87909376 = 11145^2 + 9376^2 .

It is a cyclic number.

It is not a de Polignac number, because 212120401 - 2³ = 212120393 is a prime.

It is not a weakly prime, because it can be changed into another prime (212120411) 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 as a sum of consecutive naturals, namely, 106060200 + 106060201.

It is an arithmetic number, because the mean of its divisors is an integer number (106060201).

Almost surely, 2^212120401 is an apocalyptic number.

It is an amenable number.

212120401 is a deficient number, since it is larger than the sum of its proper divisors (1).

212120401 is an equidigital number, since it uses as much as digits as its factorization.

212120401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 212120401 is about 14564.3537790044. The cubic root of 212120401 is about 596.3860547404.

Adding to 212120401 its reverse (104021212), we get a palindrome (316141613).

It can be divided in two parts, 212120 and 401, that added together give a square (212521 = 461²).

The spelling of 212120401 in words is "two hundred twelve million, one hundred twenty thousand, four hundred one".