221232400002 has 24 divisors (see below), whose sum is σ = 484082780220. Its totient is φ = 73013992800.

The previous prime is 221232400001. The next prime is 221232400009. The reversal of 221232400002 is 200004232122.

It can be written as a sum of positive squares in 2 ways, for example, as 219886904241 + 1345495761 = 468921^2 + 36681^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (221232400001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60843177 + ... + 60846812.

Almost surely, 2^221232400002 is an apocalyptic number.

221232400002 is an abundant number, since it is smaller than the sum of its proper divisors (262850380218).

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

221232400002 is a wasteful number, since it uses less digits than its factorization.

221232400002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121690098 (or 121690095 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 221232400002 its reverse (200004232122), we get a palindrome (421236632124).

The spelling of 221232400002 in words is "two hundred twenty-one billion, two hundred thirty-two million, four hundred thousand, two".