221444139 has 16 divisors (see below), whose sum is σ = 339514112. Its totient is φ = 125761248.

The previous prime is 221444137. The next prime is 221444141. The reversal of 221444139 is 931444122.

It is an interprime number because it is at equal distance from previous prime (221444137) and next prime (221444141).

It is not a de Polignac number, because 221444139 - 2¹ = 221444137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221444131) 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, 28924 + ... + 35769.

It is an arithmetic number, because the mean of its divisors is an integer number (21219632).

Almost surely, 2^221444139 is an apocalyptic number.

221444139 is a deficient number, since it is larger than the sum of its proper divisors (118069973).

221444139 is a wasteful number, since it uses less digits than its factorization.

221444139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64866.

The product of its digits is 6912, while the sum is 30.

The square root of 221444139 is about 14880.9992608023. Note that the first 3 decimals coincide. The cubic root of 221444139 is about 604.9991020636. Note that the first 3 decimals are identical.

The spelling of 221444139 in words is "two hundred twenty-one million, four hundred forty-four thousand, one hundred thirty-nine".