7138887743921 has 2 divisors, whose sum is σ = 7138887743922. Its totient is φ = 7138887743920.

The previous prime is 7138887743917. The next prime is 7138887744139. The reversal of 7138887743921 is 1293477888317.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7133680101025 + 5207642896 = 2670895^2 + 72164^2 .

It is a cyclic number.

It is not a de Polignac number, because 7138887743921 - 2² = 7138887743917 is a prime.

It is not a weakly prime, because it can be changed into another prime (7138887743021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3569443871960 + 3569443871961.

It is an arithmetic number, because the mean of its divisors is an integer number (3569443871961).

Almost surely, 2^{7138887743921} is an apocalyptic number.

It is an amenable number.

7138887743921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7138887743921 is an equidigital number, since it uses as much as digits as its factorization.

7138887743921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113799168, while the sum is 68.

The spelling of 7138887743921 in words is "seven trillion, one hundred thirty-eight billion, eight hundred eighty-seven million, seven hundred forty-three thousand, nine hundred twenty-one".