21109414 has 4 divisors (see below), whose sum is σ = 31664124. Its totient is φ = 10554706.

The previous prime is 21109409. The next prime is 21109441. The reversal of 21109414 is 41490112.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5277352 + ... + 5277355.

It is an arithmetic number, because the mean of its divisors is an integer number (7916031).

Almost surely, 2^21109414 is an apocalyptic number.

21109414 is a deficient number, since it is larger than the sum of its proper divisors (10554710).

21109414 is a wasteful number, since it uses less digits than its factorization.

21109414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10554709.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 21109414 is about 4594.4982315809. The cubic root of 21109414 is about 276.3707385653.

Adding to 21109414 its reverse (41490112), we get a palindrome (62599526).

The spelling of 21109414 in words is "twenty-one million, one hundred nine thousand, four hundred fourteen".