221499466240 has 80 divisors (see below), whose sum is σ = 571931940888. Its totient is φ = 81784406016.

The previous prime is 221499466187. The next prime is 221499466259. The reversal of 221499466240 is 42664994122.

221499466240 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 193698572544 + 27800893696 = 440112^2 + 166736^2 .

It is a tau number, because it is divible by the number of its divisors (80).

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, 3294537 + ... + 3361096.

Almost surely, 2^221499466240 is an apocalyptic number.

221499466240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221499466240 is an abundant number, since it is smaller than the sum of its proper divisors (350432474648).

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

221499466240 is an equidigital number, since it uses as much as digits as its factorization.

221499466240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6655669 (or 6655653 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 49.

The spelling of 221499466240 in words is "two hundred twenty-one billion, four hundred ninety-nine million, four hundred sixty-six thousand, two hundred forty".