1721136215417 has 2 divisors, whose sum is σ = 1721136215418. Its totient is φ = 1721136215416.

The previous prime is 1721136215389. The next prime is 1721136215431. The reversal of 1721136215417 is 7145126311271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1587572280121 + 133563935296 = 1259989^2 + 365464^2 .

It is a cyclic number.

It is not a de Polignac number, because 1721136215417 - 2¹² = 1721136211321 is a prime.

It is not a weakly prime, because it can be changed into another prime (1721136215017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860568107708 + 860568107709.

It is an arithmetic number, because the mean of its divisors is an integer number (860568107709).

Almost surely, 2^{1721136215417} is an apocalyptic number.

It is an amenable number.

1721136215417 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721136215417 is an equidigital number, since it uses as much as digits as its factorization.

1721136215417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 41.

The spelling of 1721136215417 in words is "one trillion, seven hundred twenty-one billion, one hundred thirty-six million, two hundred fifteen thousand, four hundred seventeen".