21232503361 has 2 divisors, whose sum is σ = 21232503362. Its totient is φ = 21232503360.

The previous prime is 21232503343. The next prime is 21232503367. The reversal of 21232503361 is 16330523212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18970930225 + 2261573136 = 137735^2 + 47556^2 .

It is a cyclic number.

It is not a de Polignac number, because 21232503361 - 2⁵ = 21232503329 is a prime.

It is not a weakly prime, because it can be changed into another prime (21232503367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616251680 + 10616251681.

It is an arithmetic number, because the mean of its divisors is an integer number (10616251681).

Almost surely, 2^21232503361 is an apocalyptic number.

It is an amenable number.

21232503361 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232503361 is an equidigital number, since it uses as much as digits as its factorization.

21232503361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 28.

The spelling of 21232503361 in words is "twenty-one billion, two hundred thirty-two million, five hundred three thousand, three hundred sixty-one".