21111100020111 has 8 divisors (see below), whose sum is σ = 28148441715760. Its totient is φ = 14073912502272.

The previous prime is 21111100020089. The next prime is 21111100020151. The reversal of 21111100020111 is 11102000111112.

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

It is not a de Polignac number, because 21111100020111 - 2⁶ = 21111100020047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111100020151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38224576 + ... + 38772933.

It is an arithmetic number, because the mean of its divisors is an integer number (3518555214470).

Almost surely, 2^{21111100020111} is an apocalyptic number.

21111100020111 is a deficient number, since it is larger than the sum of its proper divisors (7037341695649).

21111100020111 is an equidigital number, since it uses as much as digits as its factorization.

21111100020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77088905.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21111100020111 its reverse (11102000111112), we get a palindrome (32213100131223).

The spelling of 21111100020111 in words is "twenty-one trillion, one hundred eleven billion, one hundred million, twenty thousand, one hundred eleven".