1300745021 has 4 divisors (see below), whose sum is σ = 1377259452. Its totient is φ = 1224230592.

The previous prime is 1300745003. The next prime is 1300745051. The reversal of 1300745021 is 1205470031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 834400996 + 466344025 = 28886^2 + 21595^2 .

It is a cyclic number.

It is not a de Polignac number, because 1300745021 - 2⁶ = 1300744957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1300745051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38257190 + ... + 38257223.

It is an arithmetic number, because the mean of its divisors is an integer number (344314863).

Almost surely, 2^1300745021 is an apocalyptic number.

It is an amenable number.

1300745021 is a deficient number, since it is larger than the sum of its proper divisors (76514431).

1300745021 is an equidigital number, since it uses as much as digits as its factorization.

1300745021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76514430.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 1300745021 is about 36065.8428571966. The cubic root of 1300745021 is about 1091.6013331476.

The spelling of 1300745021 in words is "one billion, three hundred million, seven hundred forty-five thousand, twenty-one".