20515314101 has 2 divisors, whose sum is σ = 20515314102. Its totient is φ = 20515314100.

The previous prime is 20515314031. The next prime is 20515314103. The reversal of 20515314101 is 10141351502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18655462225 + 1859851876 = 136585^2 + 43126^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20515314101 is a prime.

It is a super-2 number, since 2×20515314101² (a number of 21 digits) contains 22 as substring.

Together with 20515314103, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20515314103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10257657050 + 10257657051.

It is an arithmetic number, because the mean of its divisors is an integer number (10257657051).

Almost surely, 2^20515314101 is an apocalyptic number.

It is an amenable number.

20515314101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20515314101 is an equidigital number, since it uses as much as digits as its factorization.

20515314101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 20515314101 its reverse (10141351502), we get a palindrome (30656665603).

The spelling of 20515314101 in words is "twenty billion, five hundred fifteen million, three hundred fourteen thousand, one hundred one".