20042998821 has 12 divisors (see below), whose sum is σ = 29172000000. Its totient is φ = 13259998440.

The previous prime is 20042998799. The next prime is 20042998831. The reversal of 20042998821 is 12889924002.

It is a happy number.

It is not a de Polignac number, because 20042998821 - 2¹⁰ = 20042997797 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20042998831) 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 11 ways as a sum of consecutive naturals, for example, 8498821 + ... + 8501178.

It is an arithmetic number, because the mean of its divisors is an integer number (2431000000).

Almost surely, 2^20042998821 is an apocalyptic number.

It is an amenable number.

20042998821 is a deficient number, since it is larger than the sum of its proper divisors (9129001179).

20042998821 is a wasteful number, since it uses less digits than its factorization.

20042998821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17000136 (or 17000133 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 20042998821 in words is "twenty billion, forty-two million, nine hundred ninety-eight thousand, eight hundred twenty-one".