221240453643 has 24 divisors (see below), whose sum is σ = 352215370416. Its totient is φ = 132702796800.

The previous prime is 221240453639. The next prime is 221240453671. The reversal of 221240453643 is 346354042122.

221240453643 is a `hidden beast` number, since 2 + 2 + 1 + 2 + 4 + 0 + 4 + 5 + 3 + 643 = 666.

221240453643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221240453643 - 2² = 221240453639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221240453598 and 221240453607.

It is not an unprimeable number, because it can be changed into a prime (221240453743) 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 23 ways as a sum of consecutive naturals, for example, 11509738 + ... + 11528943.

It is an arithmetic number, because the mean of its divisors is an integer number (14675640434).

Almost surely, 2^221240453643 is an apocalyptic number.

221240453643 is a deficient number, since it is larger than the sum of its proper divisors (130974916773).

221240453643 is a wasteful number, since it uses less digits than its factorization.

221240453643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23038795 (or 23038792 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

Adding to 221240453643 its reverse (346354042122), we get a palindrome (567594495765).

The spelling of 221240453643 in words is "two hundred twenty-one billion, two hundred forty million, four hundred fifty-three thousand, six hundred forty-three".