21112107 has 4 divisors (see below), whose sum is σ = 28149480. Its totient is φ = 14074736.

The previous prime is 21112103. The next prime is 21112121. The reversal of 21112107 is 70121112.

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 21112107 - 2² = 21112103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112103) 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, 3518682 + ... + 3518687.

It is an arithmetic number, because the mean of its divisors is an integer number (7037370).

Almost surely, 2^21112107 is an apocalyptic number.

21112107 is a deficient number, since it is larger than the sum of its proper divisors (7037373).

21112107 is an equidigital number, since it uses as much as digits as its factorization.

21112107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7037372.

The product of its (nonzero) digits is 28, while the sum is 15.

The square root of 21112107 is about 4594.7912901458. The cubic root of 21112107 is about 276.3824905851.

Adding to 21112107 its reverse (70121112), we get a palindrome (91233219).

The spelling of 21112107 in words is "twenty-one million, one hundred twelve thousand, one hundred seven".