7321963109521 has 2 divisors, whose sum is σ = 7321963109522. Its totient is φ = 7321963109520.

The previous prime is 7321963109459. The next prime is 7321963109609. The reversal of 7321963109521 is 1259013691237.

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., 3969259290000 + 3352703819521 = 1992300^2 + 1831039^2 .

It is a cyclic number.

It is not a de Polignac number, because 7321963109521 - 2²⁵ = 7321929555089 is a prime.

It is a super-2 number, since 2×7321963109521² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7321960109521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3660981554760 + 3660981554761.

It is an arithmetic number, because the mean of its divisors is an integer number (3660981554761).

Almost surely, 2^{7321963109521} is an apocalyptic number.

It is an amenable number.

7321963109521 is a deficient number, since it is larger than the sum of its proper divisors (1).

7321963109521 is an equidigital number, since it uses as much as digits as its factorization.

7321963109521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 49.

The spelling of 7321963109521 in words is "seven trillion, three hundred twenty-one billion, nine hundred sixty-three million, one hundred nine thousand, five hundred twenty-one".