21424116 has 24 divisors (see below), whose sum is σ = 57131200. Its totient is φ = 6121152.

The previous prime is 21424093. The next prime is 21424129. The reversal of 21424116 is 61142412.

21424116 = T₇₉₃ + T₇₉₄ + ... + T₈₅₅.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21424092 and 21424101.

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, 127441 + ... + 127608.

Almost surely, 2^21424116 is an apocalyptic number.

It is an amenable number.

21424116 is an abundant number, since it is smaller than the sum of its proper divisors (35707084).

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

21424116 is a wasteful number, since it uses less digits than its factorization.

21424116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255063 (or 255061 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

The square root of 21424116 is about 4628.6192325574. The cubic root of 21424116 is about 277.7373604246.

Adding to 21424116 its reverse (61142412), we get a palindrome (82566528).

The spelling of 21424116 in words is "twenty-one million, four hundred twenty-four thousand, one hundred sixteen".