221115254645 has 16 divisors (see below), whose sum is σ = 283432705200. Its totient is φ = 165013438464.

The previous prime is 221115254609. The next prime is 221115254651. The reversal of 221115254645 is 546452511122.

It can be written as a sum of positive squares in 8 ways, for example, as 31236320644 + 189878934001 = 176738^2 + 435751^2 .

It is a cyclic number.

It is not a de Polignac number, because 221115254645 - 2²⁴ = 221098477429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221115254599 and 221115254608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11500820 + ... + 11520029.

It is an arithmetic number, because the mean of its divisors is an integer number (17714544075).

Almost surely, 2^221115254645 is an apocalyptic number.

It is an amenable number.

221115254645 is a deficient number, since it is larger than the sum of its proper divisors (62317450555).

221115254645 is a wasteful number, since it uses less digits than its factorization.

221115254645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23020984.

The product of its digits is 96000, while the sum is 38.

Adding to 221115254645 its reverse (546452511122), we get a palindrome (767567765767).

The spelling of 221115254645 in words is "two hundred twenty-one billion, one hundred fifteen million, two hundred fifty-four thousand, six hundred forty-five".