21001412111 has 8 divisors (see below), whose sum is σ = 22252268160. Its totient is φ = 19752275968.

The previous prime is 21001412099. The next prime is 21001412189. The reversal of 21001412111 is 11121410012.

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 21001412111 - 2³⁴ = 3821542927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001412911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404786 + ... + 453711.

It is an arithmetic number, because the mean of its divisors is an integer number (2781533520).

Almost surely, 2^21001412111 is an apocalyptic number.

21001412111 is a deficient number, since it is larger than the sum of its proper divisors (1250856049).

21001412111 is a wasteful number, since it uses less digits than its factorization.

21001412111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859953.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21001412111 its reverse (11121410012), we get a palindrome (32122822123).

The spelling of 21001412111 in words is "twenty-one billion, one million, four hundred twelve thousand, one hundred eleven".