102021251 has 2 divisors, whose sum is σ = 102021252. Its totient is φ = 102021250.

The previous prime is 102021197. The next prime is 102021253. The reversal of 102021251 is 152120201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102021251 - 2¹⁰ = 102020227 is a prime.

Together with 102021253, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102021253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010625 + 51010626.

It is an arithmetic number, because the mean of its divisors is an integer number (51010626).

Almost surely, 2^102021251 is an apocalyptic number.

102021251 is a deficient number, since it is larger than the sum of its proper divisors (1).

102021251 is an equidigital number, since it uses as much as digits as its factorization.

102021251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 102021251 is about 10100.5569648411. The cubic root of 102021251 is about 467.2653188365.

Adding to 102021251 its reverse (152120201), we get a palindrome (254141452).

The spelling of 102021251 in words is "one hundred two million, twenty-one thousand, two hundred fifty-one".