20164121535 has 16 divisors (see below), whose sum is σ = 32290652160. Its totient is φ = 10744845600.

The previous prime is 20164121533. The next prime is 20164121543. The reversal of 20164121535 is 53512146102.

It is not a de Polignac number, because 20164121535 - 2¹ = 20164121533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20164121531) 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, 566695 + ... + 601224.

It is an arithmetic number, because the mean of its divisors is an integer number (2018165760).

Almost surely, 2^20164121535 is an apocalyptic number.

20164121535 is a deficient number, since it is larger than the sum of its proper divisors (12126530625).

20164121535 is a wasteful number, since it uses less digits than its factorization.

20164121535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169078.

The product of its (nonzero) digits is 7200, while the sum is 30.

Adding to 20164121535 its reverse (53512146102), we get a palindrome (73676267637).

The spelling of 20164121535 in words is "twenty billion, one hundred sixty-four million, one hundred twenty-one thousand, five hundred thirty-five".