1255780021120 has 64 divisors (see below), whose sum is σ = 3031245865440. Its totient is φ = 497435166720.

The previous prime is 1255780021087. The next prime is 1255780021141. The reversal of 1255780021120 is 211200875521.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×1255780021120² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9459111 + ... + 9590950.

Almost surely, 2^{1255780021120} is an apocalyptic number.

1255780021120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1255780021120 is an abundant number, since it is smaller than the sum of its proper divisors (1775465844320).

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

1255780021120 is a wasteful number, since it uses less digits than its factorization.

1255780021120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19050183 (or 19050171 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 34.

Adding to 1255780021120 its reverse (211200875521), we get a palindrome (1466980896641).

The spelling of 1255780021120 in words is "one trillion, two hundred fifty-five billion, seven hundred eighty million, twenty-one thousand, one hundred twenty".