221345635240 has 16 divisors (see below), whose sum is σ = 498027679380. Its totient is φ = 88538254080.

The previous prime is 221345635237. The next prime is 221345635249. The reversal of 221345635240 is 42536543122.

221345635240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 200472898564 + 20872736676 = 447742^2 + 144474^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221345635240.

It is not an unprimeable number, because it can be changed into a prime (221345635249) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2766820401 + ... + 2766820480.

Almost surely, 2^221345635240 is an apocalyptic number.

221345635240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221345635240 is an abundant number, since it is smaller than the sum of its proper divisors (276682044140).

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

221345635240 is a wasteful number, since it uses less digits than its factorization.

221345635240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5533640892 (or 5533640888 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 37.

The spelling of 221345635240 in words is "two hundred twenty-one billion, three hundred forty-five million, six hundred thirty-five thousand, two hundred forty".