193641811421 has 2 divisors, whose sum is σ = 193641811422. Its totient is φ = 193641811420.

The previous prime is 193641811409. The next prime is 193641811483. The reversal of 193641811421 is 124118146391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152295062500 + 41346748921 = 390250^2 + 203339^2 .

It is a cyclic number.

It is not a de Polignac number, because 193641811421 - 2³⁰ = 192568069597 is a prime.

It is a super-2 number, since 2×193641811421² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (193641819421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96820905710 + 96820905711.

It is an arithmetic number, because the mean of its divisors is an integer number (96820905711).

Almost surely, 2^193641811421 is an apocalyptic number.

It is an amenable number.

193641811421 is a deficient number, since it is larger than the sum of its proper divisors (1).

193641811421 is an equidigital number, since it uses as much as digits as its factorization.

193641811421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 41.

The spelling of 193641811421 in words is "one hundred ninety-three billion, six hundred forty-one million, eight hundred eleven thousand, four hundred twenty-one".