17191405421 has 2 divisors, whose sum is σ = 17191405422. Its totient is φ = 17191405420.

The previous prime is 17191405381. The next prime is 17191405463. The reversal of 17191405421 is 12450419171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17184588100 + 6817321 = 131090^2 + 2611^2 .

It is a cyclic number.

It is not a de Polignac number, because 17191405421 - 2³⁴ = 11536237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17191402421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8595702710 + 8595702711.

It is an arithmetic number, because the mean of its divisors is an integer number (8595702711).

Almost surely, 2^17191405421 is an apocalyptic number.

It is an amenable number.

17191405421 is a deficient number, since it is larger than the sum of its proper divisors (1).

17191405421 is an equidigital number, since it uses as much as digits as its factorization.

17191405421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 35.

Adding to 17191405421 its sum of digits (35), we get a square (17191405456 = 131116²).

The spelling of 17191405421 in words is "seventeen billion, one hundred ninety-one million, four hundred five thousand, four hundred twenty-one".