138061221 has 8 divisors (see below), whose sum is σ = 184761984. Its totient is φ = 91700640.

The previous prime is 138061219. The next prime is 138061223. The reversal of 138061221 is 122160831.

It is an interprime number because it is at equal distance from previous prime (138061219) and next prime (138061223).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138061221 - 2¹ = 138061219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138061191 and 138061200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138061223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84096 + ... + 85721.

It is an arithmetic number, because the mean of its divisors is an integer number (23095248).

Almost surely, 2^138061221 is an apocalyptic number.

It is an amenable number.

138061221 is a deficient number, since it is larger than the sum of its proper divisors (46700763).

138061221 is a wasteful number, since it uses less digits than its factorization.

138061221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170091.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 138061221 is about 11749.9455743420. The cubic root of 138061221 is about 516.8413314883.

The spelling of 138061221 in words is "one hundred thirty-eight million, sixty-one thousand, two hundred twenty-one".