21431414 has 8 divisors (see below), whose sum is σ = 32240808. Its totient is φ = 10684480.

The previous prime is 21431401. The next prime is 21431489. The reversal of 21431414 is 41413412.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14747 + ... + 16134.

It is an arithmetic number, because the mean of its divisors is an integer number (4030101).

Almost surely, 2^21431414 is an apocalyptic number.

21431414 is a deficient number, since it is larger than the sum of its proper divisors (10809394).

21431414 is a wasteful number, since it uses less digits than its factorization.

21431414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31230.

The product of its digits is 384, while the sum is 20.

The square root of 21431414 is about 4629.4075214870. The cubic root of 21431414 is about 277.7688933810.

Adding to 21431414 its reverse (41413412), we get a palindrome (62844826).

The spelling of 21431414 in words is "twenty-one million, four hundred thirty-one thousand, four hundred fourteen".