20354616124121 has 4 divisors (see below), whose sum is σ = 20541355721700. Its totient is φ = 20167876526544.

The previous prime is 20354616124049. The next prime is 20354616124133. The reversal of 20354616124121 is 12142161645302.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14964023408896 + 5390592715225 = 3868336^2 + 2321765^2 .

It is a cyclic number.

It is not a de Polignac number, because 20354616124121 - 2¹⁰ = 20354616123097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20354616124151) 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, 93369798626 + ... + 93369798843.

It is an arithmetic number, because the mean of its divisors is an integer number (5135338930425).

Almost surely, 2^{20354616124121} is an apocalyptic number.

It is an amenable number.

20354616124121 is a deficient number, since it is larger than the sum of its proper divisors (186739597579).

20354616124121 is a wasteful number, since it uses less digits than its factorization.

20354616124121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186739597578.

The product of its (nonzero) digits is 69120, while the sum is 38.

Adding to 20354616124121 its reverse (12142161645302), we get a palindrome (32496777769423).

The spelling of 20354616124121 in words is "twenty trillion, three hundred fifty-four billion, six hundred sixteen million, one hundred twenty-four thousand, one hundred twenty-one".