20013124161421 has 4 divisors (see below), whose sum is σ = 20025158513152. Its totient is φ = 20001089809692.

The previous prime is 20013124161403. The next prime is 20013124161449. The reversal of 20013124161421 is 12416142131002.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 20013124161421 - 2⁵ = 20013124161389 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 20013124161421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013124165421) 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, 6017173371 + ... + 6017176696.

It is an arithmetic number, because the mean of its divisors is an integer number (5006289628288).

Almost surely, 2^{20013124161421} is an apocalyptic number.

It is an amenable number.

20013124161421 is a deficient number, since it is larger than the sum of its proper divisors (12034351731).

20013124161421 is a wasteful number, since it uses less digits than its factorization.

20013124161421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12034351730.

The product of its (nonzero) digits is 2304, while the sum is 28.

Adding to 20013124161421 its reverse (12416142131002), we get a palindrome (32429266292423).

The spelling of 20013124161421 in words is "twenty trillion, thirteen billion, one hundred twenty-four million, one hundred sixty-one thousand, four hundred twenty-one".