21111121112001 has 8 divisors (see below), whose sum is σ = 28150360780800. Its totient is φ = 14072981092272.

The previous prime is 21111121111967. The next prime is 21111121112021. The reversal of 21111121112001 is 10021112111112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21111121112001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111121112021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274867470 + ... + 274944263.

It is an arithmetic number, because the mean of its divisors is an integer number (3518795097600).

Almost surely, 2^{21111121112001} is an apocalyptic number.

It is an amenable number.

21111121112001 is a deficient number, since it is larger than the sum of its proper divisors (7039239668799).

21111121112001 is a wasteful number, since it uses less digits than its factorization.

21111121112001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549824535.

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

Adding to 21111121112001 its reverse (10021112111112), we get a palindrome (31132233223113).

The spelling of 21111121112001 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty-one million, one hundred twelve thousand, one".