20112005355501 has 4 divisors (see below), whose sum is σ = 26816007140672. Its totient is φ = 13408003570332.

The previous prime is 20112005355397. The next prime is 20112005355551. The reversal of 20112005355501 is 10555350021102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20112005355501 - 2⁴¹ = 17912982099949 is a prime.

It is a super-2 number, since 2×20112005355501² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112005355551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3352000892581 + ... + 3352000892586.

It is an arithmetic number, because the mean of its divisors is an integer number (6704001785168).

Almost surely, 2^{20112005355501} is an apocalyptic number.

It is an amenable number.

20112005355501 is a deficient number, since it is larger than the sum of its proper divisors (6704001785171).

20112005355501 is an equidigital number, since it uses as much as digits as its factorization.

20112005355501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6704001785170.

The product of its (nonzero) digits is 7500, while the sum is 30.

Adding to 20112005355501 its reverse (10555350021102), we get a palindrome (30667355376603).

The spelling of 20112005355501 in words is "twenty trillion, one hundred twelve billion, five million, three hundred fifty-five thousand, five hundred one".