1280130021 has 32 divisors (see below), whose sum is σ = 2012544000. Its totient is φ = 802455984.

The previous prime is 1280130013. The next prime is 1280130043. The reversal of 1280130021 is 1200310821.

It is not a de Polignac number, because 1280130021 - 2³ = 1280130013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1280129976 and 1280130003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280130001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19170 + ... + 54108.

It is an arithmetic number, because the mean of its divisors is an integer number (62892000).

Almost surely, 2^1280130021 is an apocalyptic number.

It is an amenable number.

1280130021 is a deficient number, since it is larger than the sum of its proper divisors (732413979).

1280130021 is a wasteful number, since it uses less digits than its factorization.

1280130021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35030 (or 35024 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 1280130021 is about 35778.9046925699. The cubic root of 1280130021 is about 1085.8038090696.

Adding to 1280130021 its reverse (1200310821), we get a palindrome (2480440842).

The spelling of 1280130021 in words is "one billion, two hundred eighty million, one hundred thirty thousand, twenty-one".