139553396921 has 2 divisors, whose sum is σ = 139553396922. Its totient is φ = 139553396920.

The previous prime is 139553396897. The next prime is 139553396953. The reversal of 139553396921 is 129693355931.

It is a happy number.

139553396921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110748518521 + 28804878400 = 332789^2 + 169720^2 .

It is an emirp because it is prime and its reverse (129693355931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139553396921 is a prime.

It is not a weakly prime, because it can be changed into another prime (139553336921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69776698460 + 69776698461.

It is an arithmetic number, because the mean of its divisors is an integer number (69776698461).

Almost surely, 2^139553396921 is an apocalyptic number.

It is an amenable number.

139553396921 is a deficient number, since it is larger than the sum of its proper divisors (1).

139553396921 is an equidigital number, since it uses as much as digits as its factorization.

139553396921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5904900, while the sum is 56.

The spelling of 139553396921 in words is "one hundred thirty-nine billion, five hundred fifty-three million, three hundred ninety-six thousand, nine hundred twenty-one".