7834361617421 has 2 divisors, whose sum is σ = 7834361617422. Its totient is φ = 7834361617420.

The previous prime is 7834361617387. The next prime is 7834361617501. The reversal of 7834361617421 is 1247161634387.

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., 5915042311396 + 1919319306025 = 2432086^2 + 1385395^2 .

It is a cyclic number.

It is not a de Polignac number, because 7834361617421 - 2³⁴ = 7817181748237 is a prime.

It is a super-2 number, since 2×7834361617421² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7834361614421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3917180808710 + 3917180808711.

It is an arithmetic number, because the mean of its divisors is an integer number (3917180808711).

Almost surely, 2^{7834361617421} is an apocalyptic number.

It is an amenable number.

7834361617421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7834361617421 is an equidigital number, since it uses as much as digits as its factorization.

7834361617421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 53.

The spelling of 7834361617421 in words is "seven trillion, eight hundred thirty-four billion, three hundred sixty-one million, six hundred seventeen thousand, four hundred twenty-one".