193216510121 has 2 divisors, whose sum is σ = 193216510122. Its totient is φ = 193216510120.

The previous prime is 193216510051. The next prime is 193216510127. The reversal of 193216510121 is 121015612391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193216510096 + 25 = 439564^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 193216510121 - 2¹⁰ = 193216509097 is a prime.

It is not a weakly prime, because it can be changed into another prime (193216510127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96608255060 + 96608255061.

It is an arithmetic number, because the mean of its divisors is an integer number (96608255061).

Almost surely, 2^193216510121 is an apocalyptic number.

It is an amenable number.

193216510121 is a deficient number, since it is larger than the sum of its proper divisors (1).

193216510121 is an equidigital number, since it uses as much as digits as its factorization.

193216510121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 32.

The spelling of 193216510121 in words is "one hundred ninety-three billion, two hundred sixteen million, five hundred ten thousand, one hundred twenty-one".