21906014 has 16 divisors (see below), whose sum is σ = 35528640. Its totient is φ = 10069920.

The previous prime is 21906007. The next prime is 21906019. The reversal of 21906014 is 41060912.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21906019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5492 + ... + 8600.

It is an arithmetic number, because the mean of its divisors is an integer number (2220540).

Almost surely, 2^21906014 is an apocalyptic number.

21906014 is a deficient number, since it is larger than the sum of its proper divisors (13622626).

21906014 is a wasteful number, since it uses less digits than its factorization.

21906014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3395.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 21906014 is about 4680.3860951849. The cubic root of 21906014 is about 279.8043446064.

Adding to 21906014 its reverse (41060912), we get a palindrome (62966926).

The spelling of 21906014 in words is "twenty-one million, nine hundred six thousand, fourteen".