20015310121 has 2 divisors, whose sum is σ = 20015310122. Its totient is φ = 20015310120.

The previous prime is 20015310113. The next prime is 20015310131. The reversal of 20015310121 is 12101351002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16286864400 + 3728445721 = 127620^2 + 61061^2 .

It is a cyclic number.

It is not a de Polignac number, because 20015310121 - 2³ = 20015310113 is a prime.

It is a super-2 number, since 2×20015310121² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20015310095 and 20015310104.

It is not a weakly prime, because it can be changed into another prime (20015310101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10007655060 + 10007655061.

It is an arithmetic number, because the mean of its divisors is an integer number (10007655061).

Almost surely, 2^20015310121 is an apocalyptic number.

It is an amenable number.

20015310121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20015310121 is an equidigital number, since it uses as much as digits as its factorization.

20015310121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 16.

Adding to 20015310121 its reverse (12101351002), we get a palindrome (32116661123).

The spelling of 20015310121 in words is "twenty billion, fifteen million, three hundred ten thousand, one hundred twenty-one".