20421250512105 has 32 divisors (see below), whose sum is σ = 33041842116480. Its totient is φ = 10768725158400.

The previous prime is 20421250512073. The next prime is 20421250512199. The reversal of 20421250512105 is 50121505212402.

It is not a de Polignac number, because 20421250512105 - 2⁵ = 20421250512073 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73570830 + ... + 73847880.

It is an arithmetic number, because the mean of its divisors is an integer number (1032557566140).

Almost surely, 2^{20421250512105} is an apocalyptic number.

It is an amenable number.

20421250512105 is a deficient number, since it is larger than the sum of its proper divisors (12620591604375).

20421250512105 is a wasteful number, since it uses less digits than its factorization.

20421250512105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332361.

The product of its (nonzero) digits is 8000, while the sum is 30.

Adding to 20421250512105 its reverse (50121505212402), we get a palindrome (70542755724507).

The spelling of 20421250512105 in words is "twenty trillion, four hundred twenty-one billion, two hundred fifty million, five hundred twelve thousand, one hundred five".