138601883821 has 2 divisors, whose sum is σ = 138601883822. Its totient is φ = 138601883820.

The previous prime is 138601883773. The next prime is 138601883831. The reversal of 138601883821 is 128388106831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104723432100 + 33878451721 = 323610^2 + 184061^2 .

It is a cyclic number.

It is not a de Polignac number, because 138601883821 - 2²¹ = 138599786669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138601883831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69300941910 + 69300941911.

It is an arithmetic number, because the mean of its divisors is an integer number (69300941911).

Almost surely, 2^138601883821 is an apocalyptic number.

It is an amenable number.

138601883821 is a deficient number, since it is larger than the sum of its proper divisors (1).

138601883821 is an equidigital number, since it uses as much as digits as its factorization.

138601883821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 442368, while the sum is 49.

The spelling of 138601883821 in words is "one hundred thirty-eight billion, six hundred one million, eight hundred eighty-three thousand, eight hundred twenty-one".