20111110000021 has 4 divisors (see below), whose sum is σ = 20111138178444. Its totient is φ = 20111081821600.

The previous prime is 20111109999997. The next prime is 20111110000049. The reversal of 20111110000021 is 12000001111102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17297821674225 + 2813288325796 = 4159065^2 + 1677286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111110000021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111109999962 and 20111110000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111110000321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12990070 + ... + 14455591.

It is an arithmetic number, because the mean of its divisors is an integer number (5027784544611).

Almost surely, 2^{20111110000021} is an apocalyptic number.

It is an amenable number.

20111110000021 is a deficient number, since it is larger than the sum of its proper divisors (28178423).

20111110000021 is an equidigital number, since it uses as much as digits as its factorization.

20111110000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28178422.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 20111110000021 its reverse (12000001111102), we get a palindrome (32111111111123).

The spelling of 20111110000021 in words is "twenty trillion, one hundred eleven billion, one hundred ten million, twenty-one", and thus it is an aban number.