21111112001 has 8 divisors (see below), whose sum is σ = 24417672384. Its totient is φ = 17877223440.

The previous prime is 21111111997. The next prime is 21111112013. The reversal of 21111112001 is 10021111112.

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

It is a cyclic number.

It is not a de Polignac number, because 21111112001 - 2² = 21111111997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111112801) 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, 18167330 + ... + 18168491.

It is an arithmetic number, because the mean of its divisors is an integer number (3052209048).

Almost surely, 2^21111112001 is an apocalyptic number.

It is an amenable number.

21111112001 is a deficient number, since it is larger than the sum of its proper divisors (3306560383).

21111112001 is an equidigital number, since it uses as much as digits as its factorization.

21111112001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36335911.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21111112001 its reverse (10021111112), we get a palindrome (31132223113).

It can be divided in two parts, 2111111 and 2001, that added together give a palindrome (2113112).

The spelling of 21111112001 in words is "twenty-one billion, one hundred eleven million, one hundred twelve thousand, one".