21442124 has 24 divisors (see below), whose sum is σ = 41126400. Its totient is φ = 9700880.

The previous prime is 21442103. The next prime is 21442133. The reversal of 21442124 is 42124412.

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 = 21442096 and 21442105.

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, 9497 + ... + 11535.

It is an arithmetic number, because the mean of its divisors is an integer number (1713600).

Almost surely, 2^21442124 is an apocalyptic number.

It is an amenable number.

21442124 is a deficient number, since it is larger than the sum of its proper divisors (19684276).

21442124 is a wasteful number, since it uses less digits than its factorization.

21442124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2293 (or 2291 counting only the distinct ones).

The product of its digits is 512, while the sum is 20.

The square root of 21442124 is about 4630.5641125029. The cubic root of 21442124 is about 277.8151558353.

Adding to 21442124 its reverse (42124412), we get a palindrome (63566536).

The spelling of 21442124 in words is "twenty-one million, four hundred forty-two thousand, one hundred twenty-four".