212121222029 has 2 divisors, whose sum is σ = 212121222030. Its totient is φ = 212121222028.

The previous prime is 212121221999. The next prime is 212121222041. The reversal of 212121222029 is 920222121212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198468468004 + 13652754025 = 445498^2 + 116845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212121222029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212121221989 and 212121222007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212123222029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106060611014 + 106060611015.

It is an arithmetic number, because the mean of its divisors is an integer number (106060611015).

Almost surely, 2^212121222029 is an apocalyptic number.

It is an amenable number.

212121222029 is a deficient number, since it is larger than the sum of its proper divisors (1).

212121222029 is an equidigital number, since it uses as much as digits as its factorization.

212121222029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 212121222029 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, twenty-nine".