21185414 has 4 divisors (see below), whose sum is σ = 31778124. Its totient is φ = 10592706.

The previous prime is 21185413. The next prime is 21185419. The reversal of 21185414 is 41458112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21185413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5296352 + ... + 5296355.

It is an arithmetic number, because the mean of its divisors is an integer number (7944531).

Almost surely, 2^21185414 is an apocalyptic number.

21185414 is a deficient number, since it is larger than the sum of its proper divisors (10592710).

21185414 is a wasteful number, since it uses less digits than its factorization.

21185414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10592709.

The product of its digits is 1280, while the sum is 26.

The square root of 21185414 is about 4602.7615623667. The cubic root of 21185414 is about 276.7020128709.

The spelling of 21185414 in words is "twenty-one million, one hundred eighty-five thousand, four hundred fourteen".