1302131021 has 4 divisors (see below), whose sum is σ = 1303285500. Its totient is φ = 1300976544.

The previous prime is 1302130987. The next prime is 1302131027. The reversal of 1302131021 is 1201312031.

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 612018121 + 690112900 = 24739^2 + 26270^2 .

It is a cyclic number.

It is not a de Polignac number, because 1302131021 - 2¹⁴ = 1302114637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1302130987 and 1302131005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1302131027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 575546 + ... + 577803.

It is an arithmetic number, because the mean of its divisors is an integer number (325821375).

Almost surely, 2^1302131021 is an apocalyptic number.

It is an amenable number.

1302131021 is a deficient number, since it is larger than the sum of its proper divisors (1154479).

1302131021 is a wasteful number, since it uses less digits than its factorization.

1302131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154478.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1302131021 is about 36085.0525979941. The cubic root of 1302131021 is about 1091.9889116421.

Adding to 1302131021 its reverse (1201312031), we get a palindrome (2503443052).

The spelling of 1302131021 in words is "one billion, three hundred two million, one hundred thirty-one thousand, twenty-one".