221421323360731 has 8 divisors (see below), whose sum is σ = 242952859885680. Its totient is φ = 200532519269472.

The previous prime is 221421323360711. The next prime is 221421323360771. The reversal of 221421323360731 is 137063323124122.

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

It is not a de Polignac number, because 221421323360731 - 2⁴³ = 212625230338523 is a prime.

It is a super-2 number, since 2×221421323360731² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221421323360711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160683107701 + ... + 160683109078.

It is an arithmetic number, because the mean of its divisors is an integer number (30369107485710).

Almost surely, 2^{221421323360731} is an apocalyptic number.

221421323360731 is a deficient number, since it is larger than the sum of its proper divisors (21531536524949).

221421323360731 is a wasteful number, since it uses less digits than its factorization.

221421323360731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321366216845.

The product of its (nonzero) digits is 217728, while the sum is 40.

Adding to 221421323360731 its reverse (137063323124122), we get a palindrome (358484646484853).

The spelling of 221421323360731 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, three hundred twenty-three million, three hundred sixty thousand, seven hundred thirty-one".