1220404243240 has 64 divisors (see below), whose sum is σ = 3379580991360. Its totient is φ = 386237825280.

The previous prime is 1220404243217. The next prime is 1220404243241. The reversal of 1220404243240 is 423424040221.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 1220404243199 and 1220404243208.

It is not an unprimeable number, because it can be changed into a prime (1220404243241) 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, 167634306 + ... + 167641585.

It is an arithmetic number, because the mean of its divisors is an integer number (52805952990).

Almost surely, 2^{1220404243240} is an apocalyptic number.

1220404243240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220404243240 is an abundant number, since it is smaller than the sum of its proper divisors (2159176748120).

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

1220404243240 is a wasteful number, since it uses less digits than its factorization.

1220404243240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335275922 (or 335275918 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 1220404243240 its reverse (423424040221), we get a palindrome (1643828283461).

The spelling of 1220404243240 in words is "one trillion, two hundred twenty billion, four hundred four million, two hundred forty-three thousand, two hundred forty".