221532813767138 has 4 divisors (see below), whose sum is σ = 332299220650710. Its totient is φ = 110766406883568.

The previous prime is 221532813767099. The next prime is 221532813767159. The reversal of 221532813767138 is 831767318235122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 131404885460809 + 90127928306329 = 11463197^2 + 9493573^2 .

It is a super-2 number, since 2×221532813767138² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55383203441783 + ... + 55383203441786.

Almost surely, 2^{221532813767138} is an apocalyptic number.

221532813767138 is a deficient number, since it is larger than the sum of its proper divisors (110766406883572).

221532813767138 is a wasteful number, since it uses less digits than its factorization.

221532813767138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110766406883571.

The product of its digits is 20321280, while the sum is 59.

The spelling of 221532813767138 in words is "two hundred twenty-one trillion, five hundred thirty-two billion, eight hundred thirteen million, seven hundred sixty-seven thousand, one hundred thirty-eight".