138800060787221 has 16 divisors (see below), whose sum is σ = 142370753382000. Its totient is φ = 135264655638528.

The previous prime is 138800060787187. The next prime is 138800060787247. The reversal of 138800060787221 is 122787060008831.

It can be written as a sum of positive squares in 8 ways, for example, as 46846345224721 + 91953715562500 = 6844439^2 + 9589250^2 .

It is a cyclic number.

It is not a de Polignac number, because 138800060787221 - 2¹⁴ = 138800060770837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138800060787721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 517411595 + ... + 517679783.

It is an arithmetic number, because the mean of its divisors is an integer number (8898172086375).

Almost surely, 2^{138800060787221} is an apocalyptic number.

It is an amenable number.

138800060787221 is a deficient number, since it is larger than the sum of its proper divisors (3570692594779).

138800060787221 is a wasteful number, since it uses less digits than its factorization.

138800060787221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333928.

The product of its (nonzero) digits is 1806336, while the sum is 53.

The spelling of 138800060787221 in words is "one hundred thirty-eight trillion, eight hundred billion, sixty million, seven hundred eighty-seven thousand, two hundred twenty-one".