21111011201011 has 4 divisors (see below), whose sum is σ = 21114765610192. Its totient is φ = 21107256791832.

The previous prime is 21111011200997. The next prime is 21111011201041. The reversal of 21111011201011 is 11010211011112.

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

It is a cyclic number.

It is not a de Polignac number, because 21111011201011 - 2³⁷ = 20973572247539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21111011200982 and 21111011201000.

It is not an unprimeable number, because it can be changed into a prime (21111011201041) 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, 1877196156 + ... + 1877207401.

It is an arithmetic number, because the mean of its divisors is an integer number (5278691402548).

Almost surely, 2^{21111011201011} is an apocalyptic number.

21111011201011 is a deficient number, since it is larger than the sum of its proper divisors (3754409181).

21111011201011 is an equidigital number, since it uses as much as digits as its factorization.

21111011201011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3754409180.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 21111011201011 its reverse (11010211011112), we get a palindrome (32121222212123).

The spelling of 21111011201011 in words is "twenty-one trillion, one hundred eleven billion, eleven million, two hundred one thousand, eleven".