139412221 has 8 divisors (see below), whose sum is σ = 152681760. Its totient is φ = 126506352.

The previous prime is 139412213. The next prime is 139412227. The reversal of 139412221 is 122214931.

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

It is a cyclic number.

It is not a de Polignac number, because 139412221 - 2³ = 139412213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139412227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90115 + ... + 91648.

It is an arithmetic number, because the mean of its divisors is an integer number (19085220).

Almost surely, 2^139412221 is an apocalyptic number.

It is an amenable number.

139412221 is a deficient number, since it is larger than the sum of its proper divisors (13269539).

139412221 is a wasteful number, since it uses less digits than its factorization.

139412221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181835.

The product of its digits is 864, while the sum is 25.

The square root of 139412221 is about 11807.2952448899. The cubic root of 139412221 is about 518.5217148923.

The spelling of 139412221 in words is "one hundred thirty-nine million, four hundred twelve thousand, two hundred twenty-one".