21111110021211 has 8 divisors (see below), whose sum is σ = 32169310508544. Its totient is φ = 12063491440680.

The previous prime is 21111110021189. The next prime is 21111110021237. The reversal of 21111110021211 is 11212001111112.

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

It is not a de Polignac number, because 21111110021211 - 2¹⁷ = 21111109890139 is a prime.

It is a super-3 number, since 3×21111110021211³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21111110021711) 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, 502645476675 + ... + 502645476716.

It is an arithmetic number, because the mean of its divisors is an integer number (4021163813568).

Almost surely, 2^{21111110021211} is an apocalyptic number.

21111110021211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21111110021211 is a deficient number, since it is larger than the sum of its proper divisors (11058200487333).

21111110021211 is a wasteful number, since it uses less digits than its factorization.

21111110021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005290953401.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21111110021211 its reverse (11212001111112), we get a palindrome (32323111132323).

The spelling of 21111110021211 in words is "twenty-one trillion, one hundred eleven billion, one hundred ten million, twenty-one thousand, two hundred eleven".