7138631535821 has 2 divisors, whose sum is σ = 7138631535822. Its totient is φ = 7138631535820.

The previous prime is 7138631535793. The next prime is 7138631535901. The reversal of 7138631535821 is 1285351368317.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6029043178921 + 1109588356900 = 2455411^2 + 1053370^2 .

It is an emirp because it is prime and its reverse (1285351368317) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7138631535821 - 2⁶ = 7138631535757 is a prime.

It is a super-2 number, since 2×7138631535821² (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 (7138631535221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3569315767910 + 3569315767911.

It is an arithmetic number, because the mean of its divisors is an integer number (3569315767911).

Almost surely, 2^{7138631535821} is an apocalyptic number.

It is an amenable number.

7138631535821 is a deficient number, since it is larger than the sum of its proper divisors (1).

7138631535821 is an equidigital number, since it uses as much as digits as its factorization.

7138631535821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3628800, while the sum is 53.

The spelling of 7138631535821 in words is "seven trillion, one hundred thirty-eight billion, six hundred thirty-one million, five hundred thirty-five thousand, eight hundred twenty-one".