221144152512 has 56 divisors (see below), whose sum is σ = 585253435536. Its totient is φ = 73696718848.

The previous prime is 221144152459. The next prime is 221144152529. The reversal of 221144152512 is 215251441122.

It is a self number, because there is not a number n which added to its sum of digits gives 221144152512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 659608 + ... + 936680.

It is an arithmetic number, because the mean of its divisors is an integer number (10450954206).

Almost surely, 2^221144152512 is an apocalyptic number.

It is an amenable number.

221144152512 is an abundant number, since it is smaller than the sum of its proper divisors (364109283024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221144152512 is a wasteful number, since it uses less digits than its factorization.

221144152512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281245 (or 281235 counting only the distinct ones).

The product of its digits is 6400, while the sum is 30.

Adding to 221144152512 its reverse (215251441122), we get a palindrome (436395593634).

The spelling of 221144152512 in words is "two hundred twenty-one billion, one hundred forty-four million, one hundred fifty-two thousand, five hundred twelve".