221221111000 has 64 divisors (see below), whose sum is σ = 529696046880. Its totient is φ = 86430556800.

The previous prime is 221221110949. The next prime is 221221111019. The reversal of 221221111000 is 111122122.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2529339 + ... + 2615338.

Almost surely, 2^221221111000 is an apocalyptic number.

221221111000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221221111000 is an abundant number, since it is smaller than the sum of its proper divisors (308474935880).

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

221221111000 is a wasteful number, since it uses less digits than its factorization.

221221111000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5144741 (or 5144727 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221221111000 its reverse (111122122), we get a palindrome (221332233122).

The spelling of 221221111000 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred eleven thousand".