221200210243240 has 16 divisors (see below), whose sum is σ = 497700473047380. Its totient is φ = 88480084097280.

The previous prime is 221200210243219. The next prime is 221200210243247. The reversal of 221200210243240 is 42342012002122.

It can be written as a sum of positive squares in 2 ways, for example, as 219757439311524 + 1442770931716 = 14824218^2 + 1201154^2 .

It is not an unprimeable number, because it can be changed into a prime (221200210243247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2765002628001 + ... + 2765002628080.

Almost surely, 2^{221200210243240} is an apocalyptic number.

221200210243240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221200210243240 is an abundant number, since it is smaller than the sum of its proper divisors (276500262804140).

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

221200210243240 is a wasteful number, since it uses less digits than its factorization.

221200210243240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5530005256092 (or 5530005256088 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 221200210243240 its reverse (42342012002122), we get a palindrome (263542222245362).

The spelling of 221200210243240 in words is "two hundred twenty-one trillion, two hundred billion, two hundred ten million, two hundred forty-three thousand, two hundred forty".