1302002021 has 4 divisors (see below), whose sum is σ = 1302104544. Its totient is φ = 1301899500.

The previous prime is 1302002017. The next prime is 1302002033. The reversal of 1302002021 is 1202002031.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1302002021 - 2² = 1302002017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1302001993 and 1302002011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1302002321) 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, 28985 + ... + 58686.

It is an arithmetic number, because the mean of its divisors is an integer number (325526136).

Almost surely, 2^1302002021 is an apocalyptic number.

It is an amenable number.

1302002021 is a deficient number, since it is larger than the sum of its proper divisors (102523).

1302002021 is an equidigital number, since it uses as much as digits as its factorization.

1302002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102522.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1302002021 is about 36083.2651100202. The cubic root of 1302002021 is about 1091.9528499301.

Adding to 1302002021 its reverse (1202002031), we get a palindrome (2504004052).

The spelling of 1302002021 in words is "one billion, three hundred two million, two thousand, twenty-one".