20021021011011 has 8 divisors (see below), whose sum is σ = 27032602209280. Its totient is φ = 13178393576712.

The previous prime is 20021021011007. The next prime is 20021021011109. The reversal of 20021021011011 is 11011012012002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20021021011011 - 2² = 20021021011007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021021011711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42238440715 + ... + 42238441188.

It is an arithmetic number, because the mean of its divisors is an integer number (3379075276160).

Almost surely, 2^{20021021011011} is an apocalyptic number.

20021021011011 is a deficient number, since it is larger than the sum of its proper divisors (7011581198269).

20021021011011 is an equidigital number, since it uses as much as digits as its factorization.

20021021011011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84476881985.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20021021011011 its reverse (11011012012002), we get a palindrome (31032033023013).

The spelling of 20021021011011 in words is "twenty trillion, twenty-one billion, twenty-one million, eleven thousand, eleven".