212121102251 has 2 divisors, whose sum is σ = 212121102252. Its totient is φ = 212121102250.

The previous prime is 212121102143. The next prime is 212121102287. The reversal of 212121102251 is 152201121212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212121102251 - 2²⁶ = 212053993387 is a prime.

It is a super-3 number, since 3×212121102251³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (212121102551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106060551125 + 106060551126.

It is an arithmetic number, because the mean of its divisors is an integer number (106060551126).

Almost surely, 2^212121102251 is an apocalyptic number.

212121102251 is a deficient number, since it is larger than the sum of its proper divisors (1).

212121102251 is an equidigital number, since it uses as much as digits as its factorization.

212121102251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 20.

Adding to 212121102251 its reverse (152201121212), we get a palindrome (364322223463).

The spelling of 212121102251 in words is "two hundred twelve billion, one hundred twenty-one million, one hundred two thousand, two hundred fifty-one".