138221101449 has 12 divisors (see below), whose sum is σ = 199836389376. Its totient is φ = 92062622232.

The previous prime is 138221101373. The next prime is 138221101481. The reversal of 138221101449 is 944101122831.

138221101449 is a `hidden beast` number, since 13 + 82 + 21 + 101 + 449 = 666.

It is not a de Polignac number, because 138221101449 - 2⁷ = 138221101321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138221101489) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7054569 + ... + 7074134.

It is an arithmetic number, because the mean of its divisors is an integer number (16653032448).

Almost surely, 2^138221101449 is an apocalyptic number.

It is an amenable number.

138221101449 is a deficient number, since it is larger than the sum of its proper divisors (61615287927).

138221101449 is a wasteful number, since it uses less digits than its factorization.

138221101449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14129796 (or 14129793 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

It can be divided in two parts, 13822 and 1101449, that added together give a triangular number (1115271 = T₁₄₉₃).

The spelling of 138221101449 in words is "one hundred thirty-eight billion, two hundred twenty-one million, one hundred one thousand, four hundred forty-nine".