212421029 has 2 divisors, whose sum is σ = 212421030. Its totient is φ = 212421028.

The previous prime is 212421019. The next prime is 212421043. The reversal of 212421029 is 920124212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203718529 + 8702500 = 14273^2 + 2950^2 .

It is a cyclic number.

It is not a de Polignac number, because 212421029 - 2²⁴ = 195643813 is a prime.

It is a super-2 number, since 2×212421029² = 90245387122837682, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 212420995 and 212421013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212421019) 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, 106210514 + 106210515.

It is an arithmetic number, because the mean of its divisors is an integer number (106210515).

Almost surely, 2^212421029 is an apocalyptic number.

It is an amenable number.

212421029 is a deficient number, since it is larger than the sum of its proper divisors (1).

212421029 is an equidigital number, since it uses as much as digits as its factorization.

212421029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 212421029 is about 14574.6708024573. The cubic root of 212421029 is about 596.6676647959.

The spelling of 212421029 in words is "two hundred twelve million, four hundred twenty-one thousand, twenty-nine".