1220344404240 has 80 divisors (see below), whose sum is σ = 4074072867648. Its totient is φ = 300392467968.

The previous prime is 1220344404221. The next prime is 1220344404241. The reversal of 1220344404240 is 424044430221.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1220344404198 and 1220344404207.

It is not an unprimeable number, because it can be changed into a prime (1220344404241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195564894 + ... + 195571133.

Almost surely, 2^{1220344404240} is an apocalyptic number.

1220344404240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220344404240 is an abundant number, since it is smaller than the sum of its proper divisors (2853728463408).

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

1220344404240 is a wasteful number, since it uses less digits than its factorization.

1220344404240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391136056 (or 391136050 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 30.

Adding to 1220344404240 its reverse (424044430221), we get a palindrome (1644388834461).

The spelling of 1220344404240 in words is "one trillion, two hundred twenty billion, three hundred forty-four million, four hundred four thousand, two hundred forty".