20021021202004 has 6 divisors (see below), whose sum is σ = 35036787103514. Its totient is φ = 10010510601000.

The previous prime is 20021021201977. The next prime is 20021021202043. The reversal of 20021021202004 is 40020212012002.

It can be written as a sum of positive squares in only one way, i.e., 15547170140100 + 4473851061904 = 3942990^2 + 2115148^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2502627650247 + ... + 2502627650254.

Almost surely, 2^{20021021202004} is an apocalyptic number.

It is an amenable number.

20021021202004 is a deficient number, since it is larger than the sum of its proper divisors (15015765901510).

20021021202004 is a wasteful number, since it uses less digits than its factorization.

20021021202004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5005255300505 (or 5005255300503 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 20021021202004 its reverse (40020212012002), we get a palindrome (60041233214006).

The spelling of 20021021202004 in words is "twenty trillion, twenty-one billion, twenty-one million, two hundred two thousand, four".