102121311242 has 8 divisors (see below), whose sum is σ = 153189780996. Its totient is φ = 51058050912.

The previous prime is 102121311221. The next prime is 102121311289. The reversal of 102121311242 is 242113121201.

It can be written as a sum of positive squares in 2 ways, for example, as 84530329081 + 17590982161 = 290741^2 + 132631^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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, 1252973 + ... + 1331984.

Almost surely, 2^102121311242 is an apocalyptic number.

102121311242 is a deficient number, since it is larger than the sum of its proper divisors (51068469754).

102121311242 is a wasteful number, since it uses less digits than its factorization.

102121311242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2604712.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 102121311242 its reverse (242113121201), we get a palindrome (344234432443).

The spelling of 102121311242 in words is "one hundred two billion, one hundred twenty-one million, three hundred eleven thousand, two hundred forty-two".