1302021 has 24 divisors (see below), whose sum is σ = 2231360. Its totient is φ = 735048.

The previous prime is 1302019. The next prime is 1302029. The reversal of 1302021 is 1202031.

1302021 = T₁₃₄ + T₁₃₅ + ... + T₂₁₆.

It is a happy number.

It is not a de Polignac number, because 1302021 - 2¹ = 1302019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1301994 and 1302012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1302029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15646 + ... + 15728.

2^1302021 is an apocalyptic number.

It is an amenable number.

1302021 is a deficient number, since it is larger than the sum of its proper divisors (929339).

1302021 is an frugal number, since it uses more digits than its factorization.

1302021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1302021 is about 1141.0613480440. The cubic root of 1302021 is about 109.1958155624.

Adding to 1302021 its reverse (1202031), we get a palindrome (2504052).

It can be divided in two parts, 13020 and 21, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 1302021 in words is "one million, three hundred two thousand, twenty-one".