1300031021 has 8 divisors (see below), whose sum is σ = 1376937144. Its totient is φ = 1223173120.

The previous prime is 1300030969. The next prime is 1300031059. The reversal of 1300031021 is 1201300031.

It can be written as a sum of positive squares in 4 ways, for example, as 688012900 + 612018121 = 26230^2 + 24739^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1300031021 - 2²⁶ = 1232922157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1300030993 and 1300031011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1300036021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53771 + ... + 74103.

It is an arithmetic number, because the mean of its divisors is an integer number (172117143).

Almost surely, 2^1300031021 is an apocalyptic number.

It is an amenable number.

1300031021 is a deficient number, since it is larger than the sum of its proper divisors (76906123).

1300031021 is a wasteful number, since it uses less digits than its factorization.

1300031021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24111.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 1300031021 is about 36055.9429359433. The cubic root of 1300031021 is about 1091.4015640430.

Adding to 1300031021 its reverse (1201300031), we get a palindrome (2501331052).

The spelling of 1300031021 in words is "one billion, three hundred million, thirty-one thousand, twenty-one".