138450221291 has 2 divisors, whose sum is σ = 138450221292. Its totient is φ = 138450221290.

The previous prime is 138450221233. The next prime is 138450221303. The reversal of 138450221291 is 192122054831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138450221291 - 2³⁰ = 137376479467 is a prime.

It is not a weakly prime, because it can be changed into another prime (138450221191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69225110645 + 69225110646.

It is an arithmetic number, because the mean of its divisors is an integer number (69225110646).

Almost surely, 2^138450221291 is an apocalyptic number.

138450221291 is a deficient number, since it is larger than the sum of its proper divisors (1).

138450221291 is an equidigital number, since it uses as much as digits as its factorization.

138450221291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 38.

The spelling of 138450221291 in words is "one hundred thirty-eight billion, four hundred fifty million, two hundred twenty-one thousand, two hundred ninety-one".