221766109442 has 8 divisors (see below), whose sum is σ = 333152417532. Its totient is φ = 110715303600.

The previous prime is 221766109441. The next prime is 221766109463. The reversal of 221766109442 is 244901667122.

It can be written as a sum of positive squares in 2 ways, for example, as 164520283321 + 57245826121 = 405611^2 + 239261^2 .

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

It is a super-2 number, since 2×221766109442² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221766109393 and 221766109402.

It is not an unprimeable number, because it can be changed into a prime (221766109441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83873909 + ... + 83876552.

Almost surely, 2^221766109442 is an apocalyptic number.

221766109442 is a deficient number, since it is larger than the sum of its proper divisors (111386308090).

221766109442 is a wasteful number, since it uses less digits than its factorization.

221766109442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167751124.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 221766109442 in words is "two hundred twenty-one billion, seven hundred sixty-six million, one hundred nine thousand, four hundred forty-two".