20013127521513 has 16 divisors (see below), whose sum is σ = 30499610014080. Its totient is φ = 11434791983616.

The previous prime is 20013127521509. The next prime is 20013127521539. The reversal of 20013127521513 is 31512572131002.

It is a happy number.

It is not a de Polignac number, because 20013127521513 - 2² = 20013127521509 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20013127521553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53178270 + ... + 53553287.

It is an arithmetic number, because the mean of its divisors is an integer number (1906225625880).

Almost surely, 2^{20013127521513} is an apocalyptic number.

It is an amenable number.

20013127521513 is a deficient number, since it is larger than the sum of its proper divisors (10486482492567).

20013127521513 is a wasteful number, since it uses less digits than its factorization.

20013127521513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106740496.

The product of its (nonzero) digits is 12600, while the sum is 33.

Adding to 20013127521513 its reverse (31512572131002), we get a palindrome (51525699652515).

The spelling of 20013127521513 in words is "twenty trillion, thirteen billion, one hundred twenty-seven million, five hundred twenty-one thousand, five hundred thirteen".