1256421323304 has 192 divisors, whose sum is σ = 3976932960000. Its totient is φ = 358195582080.

The previous prime is 1256421323249. The next prime is 1256421323309. The reversal of 1256421323304 is 4033231246521.

1256421323304 is a `hidden beast` number, since 1 + 2 + 5 + 6 + 4 + 21 + 323 + 304 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1256421323309) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11329677 + ... + 11440035.

It is an arithmetic number, because the mean of its divisors is an integer number (20713192500).

Almost surely, 2^{1256421323304} is an apocalyptic number.

1256421323304 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1256421323304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1988466480000).

1256421323304 is an abundant number, since it is smaller than the sum of its proper divisors (2720511636696).

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

1256421323304 is a wasteful number, since it uses less digits than its factorization.

1256421323304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110853 (or 110832 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

Adding to 1256421323304 its reverse (4033231246521), we get a palindrome (5289652569825).

The spelling of 1256421323304 in words is "one trillion, two hundred fifty-six billion, four hundred twenty-one million, three hundred twenty-three thousand, three hundred four".