20523132121 has 2 divisors, whose sum is σ = 20523132122. Its totient is φ = 20523132120.

The previous prime is 20523132103. The next prime is 20523132137. The reversal of 20523132121 is 12123132502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14996696521 + 5526435600 = 122461^2 + 74340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20523132121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20523132092 and 20523132101.

It is not a weakly prime, because it can be changed into another prime (20523139121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10261566060 + 10261566061.

It is an arithmetic number, because the mean of its divisors is an integer number (10261566061).

Almost surely, 2^20523132121 is an apocalyptic number.

It is an amenable number.

20523132121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20523132121 is an equidigital number, since it uses as much as digits as its factorization.

20523132121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 20523132121 its reverse (12123132502), we get a palindrome (32646264623).

The spelling of 20523132121 in words is "twenty billion, five hundred twenty-three million, one hundred thirty-two thousand, one hundred twenty-one".