21111120002001 has 32 divisors (see below), whose sum is σ = 29866180622976. Its totient is φ = 13218536448000.

The previous prime is 21111120001981. The next prime is 21111120002017. The reversal of 21111120002001 is 10020002111112.

It is not a de Polignac number, because 21111120002001 - 2²⁵ = 21111086447569 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21111120004001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 164968521 + ... + 165096441.

It is an arithmetic number, because the mean of its divisors is an integer number (933318144468).

Almost surely, 2^{21111120002001} is an apocalyptic number.

It is an amenable number.

21111120002001 is a deficient number, since it is larger than the sum of its proper divisors (8755060620975).

21111120002001 is a wasteful number, since it uses less digits than its factorization.

21111120002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134673.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21111120002001 its reverse (10020002111112), we get a palindrome (31131122113113).

Subtracting from 21111120002001 its reverse (10020002111112), we obtain a square (11091117890889 = 3330333²).

The spelling of 21111120002001 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty million, two thousand, one".