102040212121 has 4 divisors (see below), whose sum is σ = 104211280512. Its totient is φ = 99869143732.

The previous prime is 102040212119. The next prime is 102040212133. The reversal of 102040212121 is 121212040201.

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, and also an emirpimes, since its reverse is a distinct semiprime: 121212040201 = 7 ⋅17316005743.

It is a cyclic number.

It is not a de Polignac number, because 102040212121 - 2¹ = 102040212119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102040212095 and 102040212104.

It is not an unprimeable number, because it can be changed into a prime (102040212161) 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, 1085534125 + ... + 1085534218.

It is an arithmetic number, because the mean of its divisors is an integer number (26052820128).

Almost surely, 2^102040212121 is an apocalyptic number.

It is an amenable number.

102040212121 is a deficient number, since it is larger than the sum of its proper divisors (2171068391).

102040212121 is an equidigital number, since it uses as much as digits as its factorization.

102040212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2171068390.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 102040212121 its reverse (121212040201), we get a palindrome (223252252322).

The spelling of 102040212121 in words is "one hundred two billion, forty million, two hundred twelve thousand, one hundred twenty-one".