21323080157 has 2 divisors, whose sum is σ = 21323080158. Its totient is φ = 21323080156.

The previous prime is 21323080139. The next prime is 21323080217. The reversal of 21323080157 is 75108032312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18952753561 + 2370326596 = 137669^2 + 48686^2 .

It is a cyclic number.

It is not a de Polignac number, because 21323080157 - 2²⁶ = 21255971293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21323080117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661540078 + 10661540079.

It is an arithmetic number, because the mean of its divisors is an integer number (10661540079).

Almost surely, 2^21323080157 is an apocalyptic number.

It is an amenable number.

21323080157 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323080157 is an equidigital number, since it uses as much as digits as its factorization.

21323080157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The spelling of 21323080157 in words is "twenty-one billion, three hundred twenty-three million, eighty thousand, one hundred fifty-seven".