221201102138 has 8 divisors (see below), whose sum is σ = 335529761940. Its totient is φ = 109357848160.

The previous prime is 221201102137. The next prime is 221201102173. The reversal of 221201102138 is 831201102122.

221201102138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 164992753249 + 56208348889 = 406193^2 + 237083^2 .

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

It is not an unprimeable number, because it can be changed into a prime (221201102137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 621351233 + ... + 621351588.

Almost surely, 2^221201102138 is an apocalyptic number.

221201102138 is a deficient number, since it is larger than the sum of its proper divisors (114328659802).

221201102138 is a wasteful number, since it uses less digits than its factorization.

221201102138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242702912.

The product of its (nonzero) digits is 384, while the sum is 23.

The spelling of 221201102138 in words is "two hundred twenty-one billion, two hundred one million, one hundred two thousand, one hundred thirty-eight".