421753170121 has 2 divisors, whose sum is σ = 421753170122. Its totient is φ = 421753170120.

The previous prime is 421753170089. The next prime is 421753170193. The reversal of 421753170121 is 121071357124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 382721636025 + 39031534096 = 618645^2 + 197564^2 .

It is a cyclic number.

It is not a de Polignac number, because 421753170121 - 2⁵ = 421753170089 is a prime.

It is a super-2 number, since 2×421753170121² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (421753171121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210876585060 + 210876585061.

It is an arithmetic number, because the mean of its divisors is an integer number (210876585061).

Almost surely, 2^421753170121 is an apocalyptic number.

It is an amenable number.

421753170121 is a deficient number, since it is larger than the sum of its proper divisors (1).

421753170121 is an equidigital number, since it uses as much as digits as its factorization.

421753170121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 34.

The spelling of 421753170121 in words is "four hundred twenty-one billion, seven hundred fifty-three million, one hundred seventy thousand, one hundred twenty-one".