21000000211111 has 8 divisors (see below), whose sum is σ = 21012836448960. Its totient is φ = 20987164805472.

The previous prime is 21000000211103. The next prime is 21000000211121. The reversal of 21000000211111 is 11111200000012.

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

It is a cyclic number.

It is not a de Polignac number, because 21000000211111 - 2³ = 21000000211103 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 (21000000211121) 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, 54680625 + ... + 55063333.

It is an arithmetic number, because the mean of its divisors is an integer number (2626604556120).

Almost surely, 2^{21000000211111} is an apocalyptic number.

21000000211111 is a deficient number, since it is larger than the sum of its proper divisors (12836237849).

21000000211111 is a wasteful number, since it uses less digits than its factorization.

21000000211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416105.

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

Adding to 21000000211111 its reverse (11111200000012), we get a palindrome (32111200211123).

The spelling of 21000000211111 in words is "twenty-one trillion, two hundred eleven thousand, one hundred eleven".