221636721137774 has 4 divisors (see below), whose sum is σ = 332455081706664. Its totient is φ = 110818360568886.

The previous prime is 221636721137747. The next prime is 221636721137791. The reversal of 221636721137774 is 477731127636122.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55409180284442 + ... + 55409180284445.

It is an arithmetic number, because the mean of its divisors is an integer number (83113770426666).

Almost surely, 2^{221636721137774} is an apocalyptic number.

221636721137774 is a deficient number, since it is larger than the sum of its proper divisors (110818360568890).

221636721137774 is a wasteful number, since it uses less digits than its factorization.

221636721137774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110818360568889.

The product of its digits is 24893568, while the sum is 59.

The spelling of 221636721137774 in words is "two hundred twenty-one trillion, six hundred thirty-six billion, seven hundred twenty-one million, one hundred thirty-seven thousand, seven hundred seventy-four".