221403213444 has 48 divisors (see below), whose sum is σ = 591500018816. Its totient is φ = 63141120000.

The previous prime is 221403213401. The next prime is 221403213461. The reversal of 221403213444 is 444312304122.

It is a super-2 number, since 2×221403213444² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2390557 + ... + 2481444.

Almost surely, 2^221403213444 is an apocalyptic number.

It is an amenable number.

221403213444 is an abundant number, since it is smaller than the sum of its proper divisors (370096805372).

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

221403213444 is a wasteful number, since it uses less digits than its factorization.

221403213444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4872556 (or 4872554 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 221403213444 its reverse (444312304122), we get a palindrome (665715517566).

The spelling of 221403213444 in words is "two hundred twenty-one billion, four hundred three million, two hundred thirteen thousand, four hundred forty-four".