221505513434 has 8 divisors (see below), whose sum is σ = 332911038420. Its totient is φ = 110535167296.

The previous prime is 221505513407. The next prime is 221505513469. The reversal of 221505513434 is 434315505122.

It can be written as a sum of positive squares in 2 ways, for example, as 213631613209 + 7873900225 = 462203^2 + 88735^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221505513394 and 221505513403.

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, 108793439 + ... + 108795474.

Almost surely, 2^221505513434 is an apocalyptic number.

221505513434 is a deficient number, since it is larger than the sum of its proper divisors (111405524986).

221505513434 is a wasteful number, since it uses less digits than its factorization.

221505513434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217589424.

The product of its (nonzero) digits is 72000, while the sum is 35.

The spelling of 221505513434 in words is "two hundred twenty-one billion, five hundred five million, five hundred thirteen thousand, four hundred thirty-four".