221574012928 has 112 divisors (see below), whose sum is σ = 463856466240. Its totient is φ = 105633611776.

The previous prime is 221574012911. The next prime is 221574012937. The reversal of 221574012928 is 829210475122.

It is a super-2 number, since 2×221574012928² (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 7 ways as a sum of consecutive naturals, for example, 65378658 + ... + 65382046.

Almost surely, 2^221574012928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221574012928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231928233120).

221574012928 is an abundant number, since it is smaller than the sum of its proper divisors (242282453312).

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

221574012928 is an equidigital number, since it uses as much as digits as its factorization.

221574012928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3785 (or 3761 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 221574012928 in words is "two hundred twenty-one billion, five hundred seventy-four million, twelve thousand, nine hundred twenty-eight".