1300123021 has 4 divisors (see below), whose sum is σ = 1301726944. Its totient is φ = 1298519100.

The previous prime is 1300123009. The next prime is 1300123031. The reversal of 1300123021 is 1203210031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1203210031 = 353 ⋅3408527.

It is a cyclic number.

It is not a de Polignac number, because 1300123021 - 2¹⁷ = 1299991949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1300122992 and 1300123010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1300123031) 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, 800745 + ... + 802366.

It is an arithmetic number, because the mean of its divisors is an integer number (325431736).

Almost surely, 2^1300123021 is an apocalyptic number.

It is an amenable number.

1300123021 is a deficient number, since it is larger than the sum of its proper divisors (1603923).

1300123021 is an equidigital number, since it uses as much as digits as its factorization.

1300123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603922.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1300123021 is about 36057.2187086026. The cubic root of 1300123021 is about 1091.4273087044.

Adding to 1300123021 its reverse (1203210031), we get a palindrome (2503333052).

The spelling of 1300123021 in words is "one billion, three hundred million, one hundred twenty-three thousand, twenty-one".