20111112021 has 128 divisors (see below), whose sum is σ = 36989632512. Its totient is φ = 9383040000.

The previous prime is 20111111981. The next prime is 20111112023. The reversal of 20111112021 is 12021111102.

It is not a de Polignac number, because 20111112021 - 2¹⁰ = 20111110997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20111111988 and 20111112006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111112023) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 18500940 + ... + 18502026.

It is an arithmetic number, because the mean of its divisors is an integer number (288981504).

Almost surely, 2^20111112021 is an apocalyptic number.

20111112021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20111112021 is a deficient number, since it is larger than the sum of its proper divisors (16878520491).

20111112021 is a wasteful number, since it uses less digits than its factorization.

20111112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283.

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

Adding to 20111112021 its reverse (12021111102), we get a palindrome (32132223123).

The spelling of 20111112021 in words is "twenty billion, one hundred eleven million, one hundred twelve thousand, twenty-one".