1302123421 has 2 divisors, whose sum is σ = 1302123422. Its totient is φ = 1302123420.

The previous prime is 1302123413. The next prime is 1302123439. The reversal of 1302123421 is 1243212031.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 998876025 + 303247396 = 31605^2 + 17414^2 .

It is a cyclic number.

It is not a de Polignac number, because 1302123421 - 2³ = 1302123413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1302133421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 651061710 + 651061711.

It is an arithmetic number, because the mean of its divisors is an integer number (651061711).

Almost surely, 2^1302123421 is an apocalyptic number.

It is an amenable number.

1302123421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1302123421 is an equidigital number, since it uses as much as digits as its factorization.

1302123421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1302123421 is about 36084.9472910797. The cubic root of 1302123421 is about 1091.9867871422.

Adding to 1302123421 its reverse (1243212031), we get a palindrome (2545335452).

The spelling of 1302123421 in words is "one billion, three hundred two million, one hundred twenty-three thousand, four hundred twenty-one".