21603142 has 8 divisors (see below), whose sum is σ = 35350632. Its totient is φ = 9819600.

The previous prime is 21603139. The next prime is 21603143. The reversal of 21603142 is 24130612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21603143) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 490959 + ... + 491002.

It is an arithmetic number, because the mean of its divisors is an integer number (4418829).

Almost surely, 2^21603142 is an apocalyptic number.

21603142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21603142 is a deficient number, since it is larger than the sum of its proper divisors (13747490).

21603142 is a wasteful number, since it uses less digits than its factorization.

21603142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981974.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21603142 is about 4647.9180285371. The cubic root of 21603142 is about 278.5088329474.

Adding to 21603142 its reverse (24130612), we get a palindrome (45733754).

The spelling of 21603142 in words is "twenty-one million, six hundred three thousand, one hundred forty-two".