21000032111 has 2 divisors, whose sum is σ = 21000032112. Its totient is φ = 21000032110.

The previous prime is 21000032101. The next prime is 21000032161. The reversal of 21000032111 is 11123000012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21000032111 - 2⁶ = 21000032047 is a prime.

It is a super-2 number, since 2×21000032111² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21000032092 and 21000032101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000032101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500016055 + 10500016056.

It is an arithmetic number, because the mean of its divisors is an integer number (10500016056).

Almost surely, 2^21000032111 is an apocalyptic number.

21000032111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000032111 is an equidigital number, since it uses as much as digits as its factorization.

21000032111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21000032111 its reverse (11123000012), we get a palindrome (32123032123).

The spelling of 21000032111 in words is "twenty-one billion, thirty-two thousand, one hundred eleven".