20515042134211 has 4 divisors (see below), whose sum is σ = 20515427236800. Its totient is φ = 20514657031624.

The previous prime is 20515042134149. The next prime is 20515042134229. The reversal of 20515042134211 is 11243124051502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20515042134211 - 2³³ = 20506452199619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20515042134241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192471376 + ... + 192577933.

It is an arithmetic number, because the mean of its divisors is an integer number (5128856809200).

Almost surely, 2^{20515042134211} is an apocalyptic number.

20515042134211 is a deficient number, since it is larger than the sum of its proper divisors (385102589).

20515042134211 is an equidigital number, since it uses as much as digits as its factorization.

20515042134211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385102588.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 20515042134211 its reverse (11243124051502), we get a palindrome (31758166185713).

The spelling of 20515042134211 in words is "twenty trillion, five hundred fifteen billion, forty-two million, one hundred thirty-four thousand, two hundred eleven".