21188414 has 8 divisors (see below), whose sum is σ = 34227480. Its totient is φ = 9779256.

The previous prime is 21188371. The next prime is 21188423. The reversal of 21188414 is 41488112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 407444 + ... + 407495.

It is an arithmetic number, because the mean of its divisors is an integer number (4278435).

Almost surely, 2^21188414 is an apocalyptic number.

21188414 is a deficient number, since it is larger than the sum of its proper divisors (13039066).

21188414 is a wasteful number, since it uses less digits than its factorization.

21188414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814954.

The product of its digits is 2048, while the sum is 29.

The square root of 21188414 is about 4603.0874421414. The cubic root of 21188414 is about 276.7150732224.

The spelling of 21188414 in words is "twenty-one million, one hundred eighty-eight thousand, four hundred fourteen".