221221231040 has 56 divisors (see below), whose sum is σ = 528110269152. Its totient is φ = 88265548800.

The previous prime is 221221231037. The next prime is 221221231057. The reversal of 221221231040 is 40132122122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 743636 + ... + 997715.

Almost surely, 2^221221231040 is an apocalyptic number.

221221231040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221221231040 is an abundant number, since it is smaller than the sum of its proper divisors (306889038112).

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

221221231040 is a wasteful number, since it uses less digits than its factorization.

221221231040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1741765 (or 1741755 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 221221231040 its reverse (40132122122), we get a palindrome (261353353162).

The spelling of 221221231040 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred thirty-one thousand, forty".