20125211321 has 2 divisors, whose sum is σ = 20125211322. Its totient is φ = 20125211320.

The previous prime is 20125211297. The next prime is 20125211401. The reversal of 20125211321 is 12311252102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19702333225 + 422878096 = 140365^2 + 20564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20125211321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20125211293 and 20125211302.

It is not a weakly prime, because it can be changed into another prime (20125271321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10062605660 + 10062605661.

It is an arithmetic number, because the mean of its divisors is an integer number (10062605661).

Almost surely, 2^20125211321 is an apocalyptic number.

It is an amenable number.

20125211321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20125211321 is an equidigital number, since it uses as much as digits as its factorization.

20125211321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 20125211321 its reverse (12311252102), we get a palindrome (32436463423).

The spelling of 20125211321 in words is "twenty billion, one hundred twenty-five million, two hundred eleven thousand, three hundred twenty-one".