221421320017163 has 4 divisors (see below), whose sum is σ = 253052937162480. Its totient is φ = 189789702871848.

The previous prime is 221421320017091. The next prime is 221421320017181. The reversal of 221421320017163 is 361710023124122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221421320017163 is a prime.

It is a super-2 number, since 2×221421320017163² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221421320037163) 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, 15815808572648 + ... + 15815808572661.

It is an arithmetic number, because the mean of its divisors is an integer number (63263234290620).

Almost surely, 2^{221421320017163} is an apocalyptic number.

221421320017163 is a deficient number, since it is larger than the sum of its proper divisors (31631617145317).

221421320017163 is an equidigital number, since it uses as much as digits as its factorization.

221421320017163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31631617145316.

The product of its (nonzero) digits is 24192, while the sum is 35.

The spelling of 221421320017163 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, three hundred twenty million, seventeen thousand, one hundred sixty-three".