221781611060 has 24 divisors (see below), whose sum is σ = 468105561000. Its totient is φ = 88262324864.

The previous prime is 221781611039. The next prime is 221781611071. The reversal of 221781611060 is 60116187122.

221781611060 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 43809001636 + 177972609424 = 209306^2 + 421868^2 .

It is a super-2 number, since 2×221781611060² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221781611060.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28140935 + ... + 28148814.

It is an arithmetic number, because the mean of its divisors is an integer number (19504398375).

Almost surely, 2^221781611060 is an apocalyptic number.

221781611060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221781611060 is an abundant number, since it is smaller than the sum of its proper divisors (246323949940).

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

221781611060 is a wasteful number, since it uses less digits than its factorization.

221781611060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56289955 (or 56289953 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

Adding to 221781611060 its reverse (60116187122), we get a palindrome (281897798182).

The spelling of 221781611060 in words is "two hundred twenty-one billion, seven hundred eighty-one million, six hundred eleven thousand, sixty".