102120121 has 4 divisors (see below), whose sum is σ = 102150144. Its totient is φ = 102090100.

The previous prime is 102120101. The next prime is 102120131. The reversal of 102120121 is 121021201.

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 102120121 - 2¹¹ = 102118073 is a prime.

It is a super-2 number, since 2×102120121² = 20857038226109282, 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 = 102120098 and 102120107.

It is not an unprimeable number, because it can be changed into a prime (102120101) 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, 9145 + ... + 16966.

It is an arithmetic number, because the mean of its divisors is an integer number (25537536).

Almost surely, 2^102120121 is an apocalyptic number.

It is an amenable number.

102120121 is a deficient number, since it is larger than the sum of its proper divisors (30023).

102120121 is an equidigital number, since it uses as much as digits as its factorization.

102120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30022.

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

The square root of 102120121 is about 10105.4500641980. The cubic root of 102120121 is about 467.4162142163.

Adding to 102120121 its reverse (121021201), we get a palindrome (223141322).

The spelling of 102120121 in words is "one hundred two million, one hundred twenty thousand, one hundred twenty-one".