20121021011 has 16 divisors (see below), whose sum is σ = 24799739328. Its totient is φ = 15897168000.

The previous prime is 20121021001. The next prime is 20121021031. The reversal of 20121021011 is 11012012102.

It is not a de Polignac number, because 20121021011 - 2¹⁴ = 20121004627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121020983 and 20121021001.

It is not an unprimeable number, because it can be changed into a prime (20121021001) 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 15 ways as a sum of consecutive naturals, for example, 93920 + ... + 221501.

It is an arithmetic number, because the mean of its divisors is an integer number (1549983708).

Almost surely, 2^20121021011 is an apocalyptic number.

20121021011 is a deficient number, since it is larger than the sum of its proper divisors (4678718317).

20121021011 is a wasteful number, since it uses less digits than its factorization.

20121021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316142.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20121021011 its reverse (11012012102), we get a palindrome (31133033113).

The spelling of 20121021011 in words is "twenty billion, one hundred twenty-one million, twenty-one thousand, eleven".