102102121 has 4 divisors (see below), whose sum is σ = 111384144. Its totient is φ = 92820100.

The previous prime is 102102109. The next prime is 102102139. The reversal of 102102121 is 121201201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 102102121 - 2⁵ = 102102089 is a prime.

It is a super-2 number, since 2×102102121² = 20849686225397282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102102098 and 102102107.

It is not an unprimeable number, because it can be changed into a prime (102103121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4640995 + ... + 4641016.

It is an arithmetic number, because the mean of its divisors is an integer number (27846036).

Almost surely, 2^102102121 is an apocalyptic number.

102102121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

102102121 is a deficient number, since it is larger than the sum of its proper divisors (9282023).

102102121 is an equidigital number, since it uses as much as digits as its factorization.

102102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9282022.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 102102121 is about 10104.5594164219. The cubic root of 102102121 is about 467.3887498729.

Adding to 102102121 its reverse (121201201), we get a palindrome (223303322).

The spelling of 102102121 in words is "one hundred two million, one hundred two thousand, one hundred twenty-one".