21101112001 has 8 divisors (see below), whose sum is σ = 21358183104. Its totient is φ = 20844985200.

The previous prime is 21101111981. The next prime is 21101112007. The reversal of 21101112001 is 10021110112.

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 21101112001 - 2²⁵ = 21067557569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101112007) 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, 191061 + ... + 280546.

It is an arithmetic number, because the mean of its divisors is an integer number (2669772888).

Almost surely, 2^21101112001 is an apocalyptic number.

It is an amenable number.

21101112001 is a deficient number, since it is larger than the sum of its proper divisors (257071103).

21101112001 is a wasteful number, since it uses less digits than its factorization.

21101112001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472151.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21101112001 its reverse (10021110112), we get a palindrome (31122222113).

It can be divided in two parts, 2110111 and 2001, that added together give a palindrome (2112112).

The spelling of 21101112001 in words is "twenty-one billion, one hundred one million, one hundred twelve thousand, one".