221212304402240 has 112 divisors (see below), whose sum is σ = 529133829882624. Its totient is φ = 88087260518400.

The previous prime is 221212304402213. The next prime is 221212304402459. The reversal of 221212304402240 is 42204403212122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70165385 + ... + 73250295.

Almost surely, 2^{221212304402240} is an apocalyptic number.

221212304402240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221212304402240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264566914941312).

221212304402240 is an abundant number, since it is smaller than the sum of its proper divisors (307921525480384).

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

221212304402240 is a wasteful number, since it uses less digits than its factorization.

221212304402240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3085936 (or 3085926 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 221212304402240 its reverse (42204403212122), we get a palindrome (263416707614362).

The spelling of 221212304402240 in words is "two hundred twenty-one trillion, two hundred twelve billion, three hundred four million, four hundred two thousand, two hundred forty".