21001314 has 16 divisors (see below), whose sum is σ = 42063552. Its totient is φ = 6990288.

The previous prime is 21001247. The next prime is 21001319. The reversal of 21001314 is 41310012.

It is a happy number.

It is a super-3 number, since 3×21001314³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21001314.

It is not an unprimeable number, because it can be changed into a prime (21001319) 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, 2812 + ... + 7064.

It is an arithmetic number, because the mean of its divisors is an integer number (2628972).

Almost surely, 2^21001314 is an apocalyptic number.

21001314 is an abundant number, since it is smaller than the sum of its proper divisors (21062238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21001314 is a wasteful number, since it uses less digits than its factorization.

21001314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5081.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21001314 is about 4582.7190618671. The cubic root of 21001314 is about 275.8981718457.

Adding to 21001314 its reverse (41310012), we get a palindrome (62311326).

The spelling of 21001314 in words is "twenty-one million, one thousand, three hundred fourteen".