21112112001 has 16 divisors (see below), whose sum is σ = 29766256128. Its totient is φ = 13288502400.

The previous prime is 21112111987. The next prime is 21112112039. The reversal of 21112112001 is 10021121112.

It is not a de Polignac number, because 21112112001 - 2⁷ = 21112111873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112117001) 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, 2764626 + ... + 2772251.

It is an arithmetic number, because the mean of its divisors is an integer number (1860391008).

Almost surely, 2^21112112001 is an apocalyptic number.

It is an amenable number.

21112112001 is a deficient number, since it is larger than the sum of its proper divisors (8654144127).

21112112001 is a wasteful number, since it uses less digits than its factorization.

21112112001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5536952.

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

Adding to 21112112001 its reverse (10021121112), we get a palindrome (31133233113).

It can be divided in two parts, 2111 and 2112001, that added together give a palindrome (2114112).

The spelling of 21112112001 in words is "twenty-one billion, one hundred twelve million, one hundred twelve thousand, one".