221279638038 has 16 divisors (see below), whose sum is σ = 445743157440. Its totient is φ = 73229232456.

The previous prime is 221279638037. The next prime is 221279638043. The reversal of 221279638038 is 830836972122.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221279638037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132660820 + ... + 132662487.

It is an arithmetic number, because the mean of its divisors is an integer number (27858947340).

Almost surely, 2^221279638038 is an apocalyptic number.

221279638038 is an abundant number, since it is smaller than the sum of its proper divisors (224463519402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221279638038 is a wasteful number, since it uses less digits than its factorization.

221279638038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265323451.

The product of its (nonzero) digits is 1741824, while the sum is 51.

The spelling of 221279638038 in words is "two hundred twenty-one billion, two hundred seventy-nine million, six hundred thirty-eight thousand, thirty-eight".