20111310021 has 32 divisors (see below), whose sum is σ = 30573648000. Its totient is φ = 11646996480.

The previous prime is 20111310007. The next prime is 20111310041. The reversal of 20111310021 is 12001311102.

It is not a de Polignac number, because 20111310021 - 2⁶ = 20111309957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20111309979 and 20111310006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111310001) 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 31 ways as a sum of consecutive naturals, for example, 15496 + ... + 201153.

It is an arithmetic number, because the mean of its divisors is an integer number (955426500).

Almost surely, 2^20111310021 is an apocalyptic number.

It is an amenable number.

20111310021 is a deficient number, since it is larger than the sum of its proper divisors (10462337979).

20111310021 is a wasteful number, since it uses less digits than its factorization.

20111310021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216789.

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

Adding to 20111310021 its reverse (12001311102), we get a palindrome (32112621123).

The spelling of 20111310021 in words is "twenty billion, one hundred eleven million, three hundred ten thousand, twenty-one".