1305434321220 has 48 divisors (see below), whose sum is σ = 3655679005440. Its totient is φ = 348071732736.

The previous prime is 1305434321183. The next prime is 1305434321293. The reversal of 1305434321220 is 221234345031.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 898597 + ... + 1848876.

It is an arithmetic number, because the mean of its divisors is an integer number (76159979280).

Almost surely, 2^{1305434321220} is an apocalyptic number.

1305434321220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1305434321220 is an abundant number, since it is smaller than the sum of its proper divisors (2350244684220).

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

1305434321220 is a wasteful number, since it uses less digits than its factorization.

1305434321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2755404 (or 2755402 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 1305434321220 its reverse (221234345031), we get a palindrome (1526668666251).

The spelling of 1305434321220 in words is "one trillion, three hundred five billion, four hundred thirty-four million, three hundred twenty-one thousand, two hundred twenty".