21102111220011 has 16 divisors (see below), whose sum is σ = 28669590385920. Its totient is φ = 13801400718560.

The previous prime is 21102111220009. The next prime is 21102111220013. The reversal of 21102111220011 is 11002211120112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21102111220009) and next prime (21102111220013).

It is a cyclic number.

It is not a de Polignac number, because 21102111220011 - 2¹ = 21102111220009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21102111220013) 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, 4172385 + ... + 7720946.

It is an arithmetic number, because the mean of its divisors is an integer number (1791849399120).

Almost surely, 2^{21102111220011} is an apocalyptic number.

21102111220011 is a deficient number, since it is larger than the sum of its proper divisors (7567479165909).

21102111220011 is a wasteful number, since it uses less digits than its factorization.

21102111220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11904546.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21102111220011 its reverse (11002211120112), we get a palindrome (32104322340123).

The spelling of 21102111220011 in words is "twenty-one trillion, one hundred two billion, one hundred eleven million, two hundred twenty thousand, eleven".