21814046 has 4 divisors (see below), whose sum is σ = 32721072. Its totient is φ = 10907022.

The previous prime is 21814021. The next prime is 21814069. The reversal of 21814046 is 64041812.

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, 5453510 + ... + 5453513.

It is an arithmetic number, because the mean of its divisors is an integer number (8180268).

Almost surely, 2^21814046 is an apocalyptic number.

21814046 is a deficient number, since it is larger than the sum of its proper divisors (10907026).

21814046 is a wasteful number, since it uses less digits than its factorization.

21814046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10907025.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 21814046 is about 4670.5509311001. The cubic root of 21814046 is about 279.4122279047.

Adding to 21814046 its reverse (64041812), we get a palindrome (85855858).

The spelling of 21814046 in words is "twenty-one million, eight hundred fourteen thousand, forty-six".