193161404922821 has 2 divisors, whose sum is σ = 193161404922822. Its totient is φ = 193161404922820.

The previous prime is 193161404922809. The next prime is 193161404922977. The reversal of 193161404922821 is 128229404161391.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168578698893796 + 24582706029025 = 12983786^2 + 4958095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-193161404922821 is a prime.

It is a super-2 number, since 2×193161404922821² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (193161404972821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96580702461410 + 96580702461411.

It is an arithmetic number, because the mean of its divisors is an integer number (96580702461411).

Almost surely, 2^{193161404922821} is an apocalyptic number.

It is an amenable number.

193161404922821 is a deficient number, since it is larger than the sum of its proper divisors (1).

193161404922821 is an equidigital number, since it uses as much as digits as its factorization.

193161404922821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1492992, while the sum is 53.

The spelling of 193161404922821 in words is "one hundred ninety-three trillion, one hundred sixty-one billion, four hundred four million, nine hundred twenty-two thousand, eight hundred twenty-one".