102121 has 2 divisors, whose sum is σ = 102122. Its totient is φ = 102120.

The previous prime is 102107. The next prime is 102139. The reversal of 102121 is 121201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57600 + 44521 = 240^2 + 211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102121 is a prime.

It is not a weakly prime, because it can be changed into another prime (102101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51060 + 51061.

It is an arithmetic number, because the mean of its divisors is an integer number (51061).

2¹⁰²¹²¹ is an apocalyptic number.

102121 is the 185-th hex number.

It is an amenable number.

102121 is a deficient number, since it is larger than the sum of its proper divisors (1).

102121 is an equidigital number, since it uses as much as digits as its factorization.

102121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 102121 is about 319.5637651549. The cubic root of 102121 is about 46.7417555309.

Adding to 102121 its reverse (121201), we get a palindrome (223322).

The spelling of 102121 in words is "one hundred two thousand, one hundred twenty-one", and thus it is an iban number.