20010841921 has 16 divisors (see below), whose sum is σ = 23356960000. Its totient is φ = 17136935424.

The previous prime is 20010841913. The next prime is 20010841937. The reversal of 20010841921 is 12914801002.

It is not a de Polignac number, because 20010841921 - 2³ = 20010841913 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 20010841921.

It is not an unprimeable number, because it can be changed into a prime (20010841121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 370180 + ... + 420778.

It is an arithmetic number, because the mean of its divisors is an integer number (1459810000).

Almost surely, 2^20010841921 is an apocalyptic number.

It is an amenable number.

20010841921 is a deficient number, since it is larger than the sum of its proper divisors (3346118079).

20010841921 is an equidigital number, since it uses as much as digits as its factorization.

20010841921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51773 (or 51759 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The spelling of 20010841921 in words is "twenty billion, ten million, eight hundred forty-one thousand, nine hundred twenty-one".