21914 has 4 divisors (see below), whose sum is σ = 32874. Its totient is φ = 10956.

The previous prime is 21911. The next prime is 21929. The reversal of 21914 is 41912.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17689 + 4225 = 133^2 + 65^2 .

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 21892 and 21901.

It is not an unprimeable number, because it can be changed into a prime (21911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5477 + ... + 5480.

2²¹⁹¹⁴ is an apocalyptic number.

21914 is a deficient number, since it is larger than the sum of its proper divisors (10960).

21914 is a wasteful number, since it uses less digits than its factorization.

21914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10959.

The product of its digits is 72, while the sum is 17.

The square root of 21914 is about 148.0337799288. The cubic root of 21914 is about 27.9838342059.

It can be divided in two parts, 2 and 1914, that multiplied together give a triangular number (3828 = T₈₇).

The spelling of 21914 in words is "twenty-one thousand, nine hundred fourteen".