20325121513 has 2 divisors, whose sum is σ = 20325121514. Its totient is φ = 20325121512.

The previous prime is 20325121463. The next prime is 20325121517. The reversal of 20325121513 is 31512152302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11294800729 + 9030320784 = 106277^2 + 95028^2 .

It is a cyclic number.

It is not a de Polignac number, because 20325121513 - 2¹³ = 20325113321 is a prime.

It is a super-2 number, since 2×20325121513² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20325121517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10162560756 + 10162560757.

It is an arithmetic number, because the mean of its divisors is an integer number (10162560757).

Almost surely, 2^20325121513 is an apocalyptic number.

It is an amenable number.

20325121513 is a deficient number, since it is larger than the sum of its proper divisors (1).

20325121513 is an equidigital number, since it uses as much as digits as its factorization.

20325121513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 20325121513 its reverse (31512152302), we get a palindrome (51837273815).

The spelling of 20325121513 in words is "twenty billion, three hundred twenty-five million, one hundred twenty-one thousand, five hundred thirteen".