1256420520120 has 64 divisors (see below), whose sum is σ = 3769348465440. Its totient is φ = 335037747200.

The previous prime is 1256420520071. The next prime is 1256420520139. The reversal of 1256420520120 is 210250246521.

It is a super-2 number, since 2×1256420520120² (a number of 25 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6709360 + ... + 6894080.

Almost surely, 2^{1256420520120} is an apocalyptic number.

1256420520120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256420520120 is an abundant number, since it is smaller than the sum of its proper divisors (2512927945320).

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

1256420520120 is a wasteful number, since it uses less digits than its factorization.

1256420520120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241416 (or 241412 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 1256420520120 its reverse (210250246521), we get a palindrome (1466670766641).

The spelling of 1256420520120 in words is "one trillion, two hundred fifty-six billion, four hundred twenty million, five hundred twenty thousand, one hundred twenty".