221771101010640 has 80 divisors (see below), whose sum is σ = 688363972058688. Its totient is φ = 59063815415808.

The previous prime is 221771101010639. The next prime is 221771101010651. The reversal of 221771101010640 is 46010101177122.

It is a tau number, because it is divible by the number of its divisors (80).

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, 586879897 + ... + 587257656.

Almost surely, 2^{221771101010640} is an apocalyptic number.

221771101010640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221771101010640 is an abundant number, since it is smaller than the sum of its proper divisors (466592871048048).

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

221771101010640 is a wasteful number, since it uses less digits than its factorization.

221771101010640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174138356 (or 1174138350 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 33.

Adding to 221771101010640 its reverse (46010101177122), we get a palindrome (267781202187762).

The spelling of 221771101010640 in words is "two hundred twenty-one trillion, seven hundred seventy-one billion, one hundred one million, ten thousand, six hundred forty".