102121211 has 2 divisors, whose sum is σ = 102121212. Its totient is φ = 102121210.

The previous prime is 102121207. The next prime is 102121213. The reversal of 102121211 is 112121201.

It is a strong prime.

It is an emirp because it is prime and its reverse (112121201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102121211 - 2² = 102121207 is a prime.

It is a super-2 number, since 2×102121211² = 20857483472213042, which contains 22 as substring.

Together with 102121213, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 102121192 and 102121201.

It is not a weakly prime, because it can be changed into another prime (102121213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51060605 + 51060606.

It is an arithmetic number, because the mean of its divisors is an integer number (51060606).

Almost surely, 2^102121211 is an apocalyptic number.

102121211 is a deficient number, since it is larger than the sum of its proper divisors (1).

102121211 is an equidigital number, since it uses as much as digits as its factorization.

102121211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 102121211 is about 10105.5039953483. The cubic root of 102121211 is about 467.4178772313.

Adding to 102121211 its reverse (112121201), we get a palindrome (214242412).

The spelling of 102121211 in words is "one hundred two million, one hundred twenty-one thousand, two hundred eleven".