15321134021 has 2 divisors, whose sum is σ = 15321134022. Its totient is φ = 15321134020.

The previous prime is 15321133979. The next prime is 15321134027. The reversal of 15321134021 is 12043112351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8932329121 + 6388804900 = 94511^2 + 79930^2 .

It is a cyclic number.

It is not a de Polignac number, because 15321134021 - 2¹⁰ = 15321132997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15321134027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7660567010 + 7660567011.

It is an arithmetic number, because the mean of its divisors is an integer number (7660567011).

Almost surely, 2^15321134021 is an apocalyptic number.

It is an amenable number.

15321134021 is a deficient number, since it is larger than the sum of its proper divisors (1).

15321134021 is an equidigital number, since it uses as much as digits as its factorization.

15321134021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 15321134021 its reverse (12043112351), we get a palindrome (27364246372).

The spelling of 15321134021 in words is "fifteen billion, three hundred twenty-one million, one hundred thirty-four thousand, twenty-one".