20455525124121 has 4 divisors (see below), whose sum is σ = 27274033498832. Its totient is φ = 13637016749412.

The previous prime is 20455525124071. The next prime is 20455525124131. The reversal of 20455525124121 is 12142152555402.

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 20455525124121 - 2¹³ = 20455525115929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20455525124121.

It is not an unprimeable number, because it can be changed into a prime (20455525124131) 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, 3409254187351 + ... + 3409254187356.

It is an arithmetic number, because the mean of its divisors is an integer number (6818508374708).

Almost surely, 2^{20455525124121} is an apocalyptic number.

It is an amenable number.

20455525124121 is a deficient number, since it is larger than the sum of its proper divisors (6818508374711).

20455525124121 is an equidigital number, since it uses as much as digits as its factorization.

20455525124121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6818508374710.

The product of its (nonzero) digits is 160000, while the sum is 39.

Adding to 20455525124121 its reverse (12142152555402), we get a palindrome (32597677679523).

The spelling of 20455525124121 in words is "twenty trillion, four hundred fifty-five billion, five hundred twenty-five million, one hundred twenty-four thousand, one hundred twenty-one".