21109114 has 36 divisors (see below), whose sum is σ = 36395406. Its totient is φ = 9176544.

The previous prime is 21109103. The next prime is 21109117. The reversal of 21109114 is 41190112.

It can be written as a sum of positive squares in 3 ways, for example, as 15468489 + 5640625 = 3933^2 + 2375^2 .

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a junction number, because it is equal to n+sod(n) for n = 21109091 and 21109100.

It is not an unprimeable number, because it can be changed into a prime (21109117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 121932 + ... + 122104.

Almost surely, 2^21109114 is an apocalyptic number.

21109114 is a deficient number, since it is larger than the sum of its proper divisors (15286292).

21109114 is a wasteful number, since it uses less digits than its factorization.

21109114 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 21109114 is about 4594.4655837214. The cubic root of 21109114 is about 276.3694293293.

Adding to 21109114 its reverse (41190112), we get a palindrome (62299226).

The spelling of 21109114 in words is "twenty-one million, one hundred nine thousand, one hundred fourteen".