21210111110001 has 32 divisors (see below), whose sum is σ = 31570235947008. Its totient is φ = 12554992779840.

The previous prime is 21210111109991. The next prime is 21210111110017. The reversal of 21210111110001 is 10001111101212.

It is not a de Polignac number, because 21210111110001 - 2⁹ = 21210111109489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21210111110021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26620920 + ... + 27406086.

It is an arithmetic number, because the mean of its divisors is an integer number (986569873344).

Almost surely, 2^{21210111110001} is an apocalyptic number.

It is an amenable number.

21210111110001 is a deficient number, since it is larger than the sum of its proper divisors (10360124837007).

21210111110001 is a wasteful number, since it uses less digits than its factorization.

21210111110001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804261.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21210111110001 its reverse (10001111101212), we get a palindrome (31211222211213).

The spelling of 21210111110001 in words is "twenty-one trillion, two hundred ten billion, one hundred eleven million, one hundred ten thousand, one".