221873735638 has 8 divisors (see below), whose sum is σ = 352387697832. Its totient is φ = 104411169696.

The previous prime is 221873735623. The next prime is 221873735651. The reversal of 221873735638 is 836537378122.

221873735638 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×221873735638² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3262849020 + ... + 3262849087.

It is an arithmetic number, because the mean of its divisors is an integer number (44048462229).

Almost surely, 2^221873735638 is an apocalyptic number.

221873735638 is a deficient number, since it is larger than the sum of its proper divisors (130513962194).

221873735638 is a wasteful number, since it uses less digits than its factorization.

221873735638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6525698126.

The product of its digits is 10160640, while the sum is 55.

The spelling of 221873735638 in words is "two hundred twenty-one billion, eight hundred seventy-three million, seven hundred thirty-five thousand, six hundred thirty-eight".