21051914 has 16 divisors (see below), whose sum is σ = 35105280. Its totient is φ = 9402480.

The previous prime is 21051913. The next prime is 21051949. The reversal of 21051914 is 41915012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21051914.

It is not an unprimeable number, because it can be changed into a prime (21051913) 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, 12254 + ... + 13865.

It is an arithmetic number, because the mean of its divisors is an integer number (2194080).

Almost surely, 2^21051914 is an apocalyptic number.

21051914 is a deficient number, since it is larger than the sum of its proper divisors (14053366).

21051914 is a wasteful number, since it uses less digits than its factorization.

21051914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26165.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 21051914 is about 4588.2364803920. The cubic root of 21051914 is about 276.1195746668.

Adding to 21051914 its reverse (41915012), we get a palindrome (62966926).

The spelling of 21051914 in words is "twenty-one million, fifty-one thousand, nine hundred fourteen".