221020401444 has 24 divisors (see below), whose sum is σ = 517013309568. Its totient is φ = 73487890080.

The previous prime is 221020401421. The next prime is 221020401461. The reversal of 221020401444 is 444104020122.

It is an unprimeable number.

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, 23192172 + ... + 23201699.

It is an arithmetic number, because the mean of its divisors is an integer number (21542221232).

Almost surely, 2^221020401444 is an apocalyptic number.

It is an amenable number.

221020401444 is an abundant number, since it is smaller than the sum of its proper divisors (295992908124).

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

221020401444 is a wasteful number, since it uses less digits than its factorization.

221020401444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46394275 (or 46394273 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 221020401444 its reverse (444104020122), we get a palindrome (665124421566).

The spelling of 221020401444 in words is "two hundred twenty-one billion, twenty million, four hundred one thousand, four hundred forty-four".