21111000107 has 4 divisors (see below), whose sum is σ = 21114698496. Its totient is φ = 21107301720.

The previous prime is 21111000091. The next prime is 21111000137. The reversal of 21111000107 is 70100011112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21111000107 - 2⁴ = 21111000091 is a prime.

It is a super-2 number, since 2×21111000107² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21111000091 and 21111000100.

It is not an unprimeable number, because it can be changed into a prime (21111000137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1840619 + ... + 1852052.

It is an arithmetic number, because the mean of its divisors is an integer number (5278674624).

Almost surely, 2^21111000107 is an apocalyptic number.

21111000107 is a deficient number, since it is larger than the sum of its proper divisors (3698389).

21111000107 is an equidigital number, since it uses as much as digits as its factorization.

21111000107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3698388.

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

Adding to 21111000107 its reverse (70100011112), we get a palindrome (91211011219).

The spelling of 21111000107 in words is "twenty-one billion, one hundred eleven million, one hundred seven", and thus it is an aban number.