221244412240 has 40 divisors (see below), whose sum is σ = 525337804800. Its totient is φ = 86614832256.

The previous prime is 221244412211. The next prime is 221244412243. The reversal of 221244412240 is 42214442122.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 221244412199 and 221244412208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221244412243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29417040 + ... + 29424559.

It is an arithmetic number, because the mean of its divisors is an integer number (13133445120).

Almost surely, 2^221244412240 is an apocalyptic number.

221244412240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221244412240 is an abundant number, since it is smaller than the sum of its proper divisors (304093392560).

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

221244412240 is a wasteful number, since it uses less digits than its factorization.

221244412240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58841659 (or 58841653 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 28.

Adding to 221244412240 its reverse (42214442122), we get a palindrome (263458854362).

The spelling of 221244412240 in words is "two hundred twenty-one billion, two hundred forty-four million, four hundred twelve thousand, two hundred forty".