221640356250747 has 64 divisors (see below), whose sum is σ = 381932104780800. Its totient is φ = 124406798192640.

The previous prime is 221640356250721. The next prime is 221640356250749. The reversal of 221640356250747 is 747052653046122.

221640356250747 is a `hidden beast` number, since 2 + 2 + 1 + 6 + 4 + 0 + 3 + 5 + 625 + 0 + 7 + 4 + 7 = 666.

It is not a de Polignac number, because 221640356250747 - 2⁷ = 221640356250619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221640356250693 and 221640356250702.

It is not an unprimeable number, because it can be changed into a prime (221640356250749) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4487238 + ... + 21527099.

It is an arithmetic number, because the mean of its divisors is an integer number (5967689137200).

Almost surely, 2^{221640356250747} is an apocalyptic number.

221640356250747 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

221640356250747 is a deficient number, since it is larger than the sum of its proper divisors (160291748530053).

221640356250747 is a wasteful number, since it uses less digits than its factorization.

221640356250747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26015153 (or 26015147 counting only the distinct ones).

The product of its (nonzero) digits is 16934400, while the sum is 54.

The spelling of 221640356250747 in words is "two hundred twenty-one trillion, six hundred forty billion, three hundred fifty-six million, two hundred fifty thousand, seven hundred forty-seven".