21000112001 has 16 divisors (see below), whose sum is σ = 23291496000. Its totient is φ = 18774984000.

The previous prime is 21000111961. The next prime is 21000112013. The reversal of 21000112001 is 10021100012.

It is a cyclic number.

It is not a de Polignac number, because 21000112001 - 2³⁴ = 3820242817 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21000112001.

It is not an unprimeable number, because it can be changed into a prime (21000112031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102110 + ... + 228968.

It is an arithmetic number, because the mean of its divisors is an integer number (1455718500).

Almost surely, 2^21000112001 is an apocalyptic number.

It is an amenable number.

21000112001 is a deficient number, since it is larger than the sum of its proper divisors (2291383999).

21000112001 is a wasteful number, since it uses less digits than its factorization.

21000112001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127120.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21000112001 its reverse (10021100012), we get a palindrome (31021212013).

It can be divided in two parts, 2100011 and 2001, that added together give a palindrome (2102012).

The spelling of 21000112001 in words is "twenty-one billion, one hundred twelve thousand, one".