21442120 has 32 divisors (see below), whose sum is σ = 55137600. Its totient is φ = 7351488.

The previous prime is 21442103. The next prime is 21442133. The reversal of 21442120 is 2124412.

It is a junction number, because it is equal to n+sod(n) for n = 21442094 and 21442103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38010 + ... + 38569.

It is an arithmetic number, because the mean of its divisors is an integer number (1723050).

Almost surely, 2^21442120 is an apocalyptic number.

21442120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21442120 is an abundant number, since it is smaller than the sum of its proper divisors (33695480).

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

21442120 is a wasteful number, since it uses less digits than its factorization.

21442120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76597 (or 76593 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 21442120 is about 4630.5636805901. The cubic root of 21442120 is about 277.8151385600.

Adding to 21442120 its reverse (2124412), we get a palindrome (23566532).

The spelling of 21442120 in words is "twenty-one million, four hundred forty-two thousand, one hundred twenty".