1302023221 has 4 divisors (see below), whose sum is σ = 1304923500. Its totient is φ = 1299122944.

The previous prime is 1302023213. The next prime is 1302023227. The reversal of 1302023221 is 1223202031.

1302023221 = 230² + 231² + ... + 1576².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1223202031 = 23 ⋅53182697.

It can be written as a sum of positive squares in 2 ways, for example, as 1132659025 + 169364196 = 33655^2 + 13014^2 .

It is a cyclic number.

It is not a de Polignac number, because 1302023221 - 2³ = 1302023213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1302023195 and 1302023204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1302023227) 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, 1449466 + ... + 1450363.

It is an arithmetic number, because the mean of its divisors is an integer number (326230875).

Almost surely, 2^1302023221 is an apocalyptic number.

It is an amenable number.

1302023221 is a deficient number, since it is larger than the sum of its proper divisors (2900279).

1302023221 is an equidigital number, since it uses as much as digits as its factorization.

1302023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2900278.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1302023221 is about 36083.5588738140. The cubic root of 1302023221 is about 1091.9587765145.

Adding to 1302023221 its reverse (1223202031), we get a palindrome (2525225252).

The spelling of 1302023221 in words is "one billion, three hundred two million, twenty-three thousand, two hundred twenty-one".