21001132111 has 8 divisors (see below), whose sum is σ = 21327857280. Its totient is φ = 20674797528.

The previous prime is 21001132049. The next prime is 21001132157. The reversal of 21001132111 is 11123110012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21001132111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21001132091 and 21001132100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001132171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11670 + ... + 205276.

It is an arithmetic number, because the mean of its divisors is an integer number (2665982160).

Almost surely, 2^21001132111 is an apocalyptic number.

21001132111 is a deficient number, since it is larger than the sum of its proper divisors (326725169).

21001132111 is a wasteful number, since it uses less digits than its factorization.

21001132111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195293.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21001132111 its reverse (11123110012), we get a palindrome (32124242123).

The spelling of 21001132111 in words is "twenty-one billion, one million, one hundred thirty-two thousand, one hundred eleven".