221640352231621 has 8 divisors (see below), whose sum is σ = 225397413446400. Its totient is φ = 217883305852800.

The previous prime is 221640352231609. The next prime is 221640352231633. The reversal of 221640352231621 is 126132253046122.

It is an interprime number because it is at equal distance from previous prime (221640352231609) and next prime (221640352231633).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221640352231621 - 2⁴¹ = 219441328976069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221640352237621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28820821 + ... + 35692021.

It is an arithmetic number, because the mean of its divisors is an integer number (28174676680800).

Almost surely, 2^{221640352231621} is an apocalyptic number.

It is an amenable number.

221640352231621 is a deficient number, since it is larger than the sum of its proper divisors (3757061214779).

221640352231621 is an equidigital number, since it uses as much as digits as its factorization.

221640352231621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7417979.

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 221640352231621 in words is "two hundred twenty-one trillion, six hundred forty billion, three hundred fifty-two million, two hundred thirty-one thousand, six hundred twenty-one".