20013145134421 has 8 divisors (see below), whose sum is σ = 20032702039064. Its totient is φ = 19993594590720.

The previous prime is 20013145134373. The next prime is 20013145134439. The reversal of 20013145134421 is 12443154131002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16064777431921 + 3948367702500 = 4008089^2 + 1987050^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20013145134421 - 2⁹ = 20013145133909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013145134481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4717561 + ... + 7891873.

It is an arithmetic number, because the mean of its divisors is an integer number (2504087754883).

Almost surely, 2^{20013145134421} is an apocalyptic number.

It is an amenable number.

20013145134421 is a deficient number, since it is larger than the sum of its proper divisors (19556904643).

20013145134421 is a wasteful number, since it uses less digits than its factorization.

20013145134421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3180471.

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 20013145134421 its reverse (12443154131002), we get a palindrome (32456299265423).

The spelling of 20013145134421 in words is "twenty trillion, thirteen billion, one hundred forty-five million, one hundred thirty-four thousand, four hundred twenty-one".