20523154321 has 2 divisors, whose sum is σ = 20523154322. Its totient is φ = 20523154320.

The previous prime is 20523154303. The next prime is 20523154343. The reversal of 20523154321 is 12345132502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20423553921 + 99600400 = 142911^2 + 9980^2 .

It is a cyclic number.

It is not a de Polignac number, because 20523154321 - 2¹³ = 20523146129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20523154321.

It is not a weakly prime, because it can be changed into another prime (20523154121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10261577160 + 10261577161.

It is an arithmetic number, because the mean of its divisors is an integer number (10261577161).

Almost surely, 2^20523154321 is an apocalyptic number.

It is an amenable number.

20523154321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20523154321 is an equidigital number, since it uses as much as digits as its factorization.

20523154321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 20523154321 its reverse (12345132502), we get a palindrome (32868286823).

The spelling of 20523154321 in words is "twenty billion, five hundred twenty-three million, one hundred fifty-four thousand, three hundred twenty-one".