1300021 has 2 divisors, whose sum is σ = 1300022. Its totient is φ = 1300020.

The previous prime is 1299989. The next prime is 1300027. The reversal of 1300021 is 1200031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1060900 + 239121 = 1030^2 + 489^2 .

It is a cyclic number.

It is not a de Polignac number, because 1300021 - 2⁵ = 1299989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1299977 and 1300013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1300027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 650010 + 650011.

It is an arithmetic number, because the mean of its divisors is an integer number (650011).

2^1300021 is an apocalyptic number.

It is an amenable number.

1300021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1300021 is an equidigital number, since it uses as much as digits as its factorization.

1300021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6, while the sum is 7.

The square root of 1300021 is about 1140.1846341712. The cubic root of 1300021 is about 109.1398759760.

Adding to 1300021 its reverse (1200031), we get a palindrome (2500052).

The spelling of 1300021 in words is "one million, three hundred thousand, twenty-one".