102010002121 has 4 divisors (see below), whose sum is σ = 103020002244. Its totient is φ = 101000002000.

The previous prime is 102010002089. The next prime is 102010002131. The reversal of 102010002121 is 121200010201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121200010201 = 101 ⋅1200000101.

It can be written as a sum of positive squares in 2 ways, for example, as 96708560400 + 5301441721 = 310980^2 + 72811^2 .

It is a cyclic number.

It is not a de Polignac number, because 102010002121 - 2⁵ = 102010002089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102010002098 and 102010002107.

It is not an unprimeable number, because it can be changed into a prime (102010002131) 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, 504999910 + ... + 505000111.

It is an arithmetic number, because the mean of its divisors is an integer number (25755000561).

Almost surely, 2^102010002121 is an apocalyptic number.

It is an amenable number.

102010002121 is a deficient number, since it is larger than the sum of its proper divisors (1010000123).

102010002121 is a wasteful number, since it uses less digits than its factorization.

102010002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010000122.

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

Adding to 102010002121 its reverse (121200010201), we get a palindrome (223210012322).

The spelling of 102010002121 in words is "one hundred two billion, ten million, two thousand, one hundred twenty-one".