1221404243130 has 192 divisors, whose sum is σ = 3529336382208. Its totient is φ = 303125898240.

The previous prime is 1221404243117. The next prime is 1221404243173. The reversal of 1221404243130 is 313424041221.

1221404243130 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 404 + 243 + 13 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1221404243094 and 1221404243103.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1772610 + ... + 2363250.

It is an arithmetic number, because the mean of its divisors is an integer number (18381960324).

Almost surely, 2^{1221404243130} is an apocalyptic number.

1221404243130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221404243130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1764668191104).

1221404243130 is an abundant number, since it is smaller than the sum of its proper divisors (2307932139078).

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

1221404243130 is a wasteful number, since it uses less digits than its factorization.

1221404243130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590723 (or 590711 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 1221404243130 its reverse (313424041221), we get a palindrome (1534828284351).

The spelling of 1221404243130 in words is "one trillion, two hundred twenty-one billion, four hundred four million, two hundred forty-three thousand, one hundred thirty".