221421203615712 has 48 divisors (see below), whose sum is σ = 581258478829392. Its totient is φ = 73803535257600.

The previous prime is 221421203615629. The next prime is 221421203615713. The reversal of 221421203615712 is 217516302124122.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221421203615713) 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, 53180539 + ... + 57192762.

It is an arithmetic number, because the mean of its divisors is an integer number (12109551642279).

Almost surely, 2^{221421203615712} is an apocalyptic number.

It is an amenable number.

221421203615712 is an abundant number, since it is smaller than the sum of its proper divisors (359837275213680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221421203615712 is a wasteful number, since it uses less digits than its factorization.

221421203615712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110394211 (or 110394203 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

Adding to 221421203615712 its reverse (217516302124122), we get a palindrome (438937505739834).

The spelling of 221421203615712 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred three million, six hundred fifteen thousand, seven hundred twelve".