102102121421 has 2 divisors, whose sum is σ = 102102121422. Its totient is φ = 102102121420.

The previous prime is 102102121411. The next prime is 102102121439. The reversal of 102102121421 is 124121201201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93226408900 + 8875712521 = 305330^2 + 94211^2 .

It is a cyclic number.

It is not a de Polignac number, because 102102121421 - 2⁶ = 102102121357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102102121421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102102121411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51051060710 + 51051060711.

It is an arithmetic number, because the mean of its divisors is an integer number (51051060711).

Almost surely, 2^102102121421 is an apocalyptic number.

It is an amenable number.

102102121421 is a deficient number, since it is larger than the sum of its proper divisors (1).

102102121421 is an equidigital number, since it uses as much as digits as its factorization.

102102121421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 102102121421 its reverse (124121201201), we get a palindrome (226223322622).

The spelling of 102102121421 in words is "one hundred two billion, one hundred two million, one hundred twenty-one thousand, four hundred twenty-one".