20054142521 has 4 divisors (see below), whose sum is σ = 22919020032. Its totient is φ = 17189265012.

The previous prime is 20054142517. The next prime is 20054142529. The reversal of 20054142521 is 12524145002.

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 20054142521 - 2² = 20054142517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20054142529) 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, 1432438745 + ... + 1432438758.

It is an arithmetic number, because the mean of its divisors is an integer number (5729755008).

Almost surely, 2^20054142521 is an apocalyptic number.

It is an amenable number.

20054142521 is a deficient number, since it is larger than the sum of its proper divisors (2864877511).

20054142521 is an equidigital number, since it uses as much as digits as its factorization.

20054142521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2864877510.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 20054142521 its reverse (12524145002), we get a palindrome (32578287523).

The spelling of 20054142521 in words is "twenty billion, fifty-four million, one hundred forty-two thousand, five hundred twenty-one".