21000001112111 has 8 divisors (see below), whose sum is σ = 24000028991904. Its totient is φ = 17999980162560.

The previous prime is 21000001112063. The next prime is 21000001112117. The reversal of 21000001112111 is 11121110000012.

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 21000001112111 - 2⁶ = 21000001112047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21000001112092 and 21000001112101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000001112117) 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, 10947551 + ... + 12721983.

It is an arithmetic number, because the mean of its divisors is an integer number (3000003623988).

Almost surely, 2^{21000001112111} is an apocalyptic number.

21000001112111 is a deficient number, since it is larger than the sum of its proper divisors (3000027879793).

21000001112111 is a wasteful number, since it uses less digits than its factorization.

21000001112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3465121.

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

Adding to 21000001112111 its reverse (11121110000012), we get a palindrome (32121111112123).

The spelling of 21000001112111 in words is "twenty-one trillion, one million, one hundred twelve thousand, one hundred eleven".