20030202821 has 16 divisors (see below), whose sum is σ = 21362140800. Its totient is φ = 18745005888.

The previous prime is 20030202811. The next prime is 20030202823. The reversal of 20030202821 is 12820203002.

It is a cyclic number.

It is not a de Polignac number, because 20030202821 - 2³⁴ = 2850333637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20030202793 and 20030202802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20030202823) 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, 246710 + ... + 317688.

It is an arithmetic number, because the mean of its divisors is an integer number (1335133800).

Almost surely, 2^20030202821 is an apocalyptic number.

It is an amenable number.

20030202821 is a deficient number, since it is larger than the sum of its proper divisors (1331937979).

20030202821 is a wasteful number, since it uses less digits than its factorization.

20030202821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71308.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20030202821 its reverse (12820203002), we get a palindrome (32850405823).

The spelling of 20030202821 in words is "twenty billion, thirty million, two hundred two thousand, eight hundred twenty-one".