7317421421 has 2 divisors, whose sum is σ = 7317421422. Its totient is φ = 7317421420.

The previous prime is 7317421409. The next prime is 7317421453. The reversal of 7317421421 is 1241247137.

It is an a-pointer prime, because the next prime (7317421453) can be obtained adding 7317421421 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6719080900 + 598340521 = 81970^2 + 24461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7317421421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7317421471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3658710710 + 3658710711.

It is an arithmetic number, because the mean of its divisors is an integer number (3658710711).

Almost surely, 2^7317421421 is an apocalyptic number.

It is an amenable number.

7317421421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7317421421 is an equidigital number, since it uses as much as digits as its factorization.

7317421421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 32.

The square root of 7317421421 is about 85541.9278541231. The cubic root of 7317421421 is about 1941.4193585302.

Adding to 7317421421 its reverse (1241247137), we get a palindrome (8558668558).

The spelling of 7317421421 in words is "seven billion, three hundred seventeen million, four hundred twenty-one thousand, four hundred twenty-one".