20021022021011 has 4 divisors (see below), whose sum is σ = 21841114932024. Its totient is φ = 18200929110000.

The previous prime is 20021022020977. The next prime is 20021022021031. The reversal of 20021022021011 is 11012022012002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20021022021011 - 2³⁴ = 20003842151827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021022021031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 910046455490 + ... + 910046455511.

It is an arithmetic number, because the mean of its divisors is an integer number (5460278733006).

Almost surely, 2^{20021022021011} is an apocalyptic number.

20021022021011 is a deficient number, since it is larger than the sum of its proper divisors (1820092911013).

20021022021011 is a wasteful number, since it uses less digits than its factorization.

20021022021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820092911012.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20021022021011 its reverse (11012022012002), we get a palindrome (31033044033013).

Subtracting from 20021022021011 its reverse (11012022012002), we obtain a palindrome (9009000009009).

The spelling of 20021022021011 in words is "twenty trillion, twenty-one billion, twenty-two million, twenty-one thousand, eleven".