21115414 has 4 divisors (see below), whose sum is σ = 31673124. Its totient is φ = 10557706.

The previous prime is 21115379. The next prime is 21115417. The reversal of 21115414 is 41451112.

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

It is a junction number, because it is equal to n+sod(n) for n = 21115391 and 21115400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5278852 + ... + 5278855.

It is an arithmetic number, because the mean of its divisors is an integer number (7918281).

Almost surely, 2^21115414 is an apocalyptic number.

21115414 is a deficient number, since it is larger than the sum of its proper divisors (10557710).

21115414 is a wasteful number, since it uses less digits than its factorization.

21115414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10557709.

The product of its digits is 160, while the sum is 19.

The square root of 21115414 is about 4595.1511400606. The cubic root of 21115414 is about 276.3969206809.

Adding to 21115414 its reverse (41451112), we get a palindrome (62566526).

It can be divided in two parts, 211 and 15414, that added together give a 6-th power (15625 = 5⁶).

The spelling of 21115414 in words is "twenty-one million, one hundred fifteen thousand, four hundred fourteen".