21144214 has 16 divisors (see below), whose sum is σ = 39035808. Its totient is φ = 8364672.

The previous prime is 21144203. The next prime is 21144223. The reversal of 21144214 is 41244112.

It is a junction number, because it is equal to n+sod(n) for n = 21144191 and 21144200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57907 + ... + 58270.

It is an arithmetic number, because the mean of its divisors is an integer number (2439738).

Almost surely, 2^21144214 is an apocalyptic number.

21144214 is a deficient number, since it is larger than the sum of its proper divisors (17891594).

21144214 is a wasteful number, since it uses less digits than its factorization.

21144214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116199.

The product of its digits is 256, while the sum is 19.

The square root of 21144214 is about 4598.2838102927. The cubic root of 21144214 is about 276.5225258428.

Adding to 21144214 its reverse (41244112), we get a palindrome (62388326).

It can be divided in two parts, 2114 and 4214, that added together give a triangular number (6328 = T₁₁₂).

The spelling of 21144214 in words is "twenty-one million, one hundred forty-four thousand, two hundred fourteen".