221443794002 has 6 divisors (see below), whose sum is σ = 332166689253. Its totient is φ = 110721564252.

The previous prime is 221443794001. The next prime is 221443794017. The reversal of 221443794002 is 200497344122.

It can be written as a sum of positive squares in 2 ways, for example, as 206887612801 + 14556181201 = 454849^2 + 120649^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=332749.

It is a super-2 number, since 2×221443794002² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221443794001) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 499124 + ... + 831872.

Almost surely, 2^221443794002 is an apocalyptic number.

221443794002 is a deficient number, since it is larger than the sum of its proper divisors (110722895251).

221443794002 is an frugal number, since it uses more digits than its factorization.

221443794002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665500 (or 332751 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 38.

The spelling of 221443794002 in words is "two hundred twenty-one billion, four hundred forty-three million, seven hundred ninety-four thousand, two".