102040002121 has 4 divisors (see below), whose sum is σ = 102724834500. Its totient is φ = 101355169744.

The previous prime is 102040002079. The next prime is 102040002131. The reversal of 102040002121 is 121200040201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18276065721 + 83763936400 = 135189^2 + 289420^2 .

It is a cyclic number.

It is not a de Polignac number, because 102040002121 - 2¹⁹ = 102039477833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102040002131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342415966 + ... + 342416263.

It is an arithmetic number, because the mean of its divisors is an integer number (25681208625).

Almost surely, 2^102040002121 is an apocalyptic number.

It is an amenable number.

102040002121 is a deficient number, since it is larger than the sum of its proper divisors (684832379).

102040002121 is an equidigital number, since it uses as much as digits as its factorization.

102040002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684832378.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 102040002121 its reverse (121200040201), we get a palindrome (223240042322).

The spelling of 102040002121 in words is "one hundred two billion, forty million, two thousand, one hundred twenty-one".