21111121210011 has 16 divisors (see below), whose sum is σ = 32714570400000. Its totient is φ = 11859031768608.

The previous prime is 21111121210007. The next prime is 21111121210033. The reversal of 21111121210011 is 11001212111112.

It is not a de Polignac number, because 21111121210011 - 2² = 21111121210007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111121210051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8519418136 + ... + 8519420613.

It is an arithmetic number, because the mean of its divisors is an integer number (2044660650000).

Almost surely, 2^{21111121210011} is an apocalyptic number.

21111121210011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21111121210011 is a deficient number, since it is larger than the sum of its proper divisors (11603449189989).

21111121210011 is a wasteful number, since it uses less digits than its factorization.

21111121210011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17038838818.

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

Adding to 21111121210011 its reverse (11001212111112), we get a palindrome (32112333321123).

The spelling of 21111121210011 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty-one million, two hundred ten thousand, eleven".