221144123421421 has 12 divisors (see below), whose sum is σ = 232380939290400. Its totient is φ = 210383146339320.

The previous prime is 221144123421409. The next prime is 221144123421499. The reversal of 221144123421421 is 124124321441122.

It is a de Polignac number, because none of the positive numbers 2^k-221144123421421 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 (221144123421521) 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 11 ways as a sum of consecutive naturals, for example, 1950102241 + ... + 1950215638.

It is an arithmetic number, because the mean of its divisors is an integer number (19365078274200).

Almost surely, 2^{221144123421421} is an apocalyptic number.

It is an amenable number.

221144123421421 is a deficient number, since it is larger than the sum of its proper divisors (11236815868979).

221144123421421 is an equidigital number, since it uses as much as digits as its factorization.

221144123421421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3900318000 (or 3900317969 counting only the distinct ones).

The product of its digits is 24576, while the sum is 34.

Adding to 221144123421421 its reverse (124124321441122), we get a palindrome (345268444862543).

The spelling of 221144123421421 in words is "two hundred twenty-one trillion, one hundred forty-four billion, one hundred twenty-three million, four hundred twenty-one thousand, four hundred twenty-one".