21142573 has 8 divisors (see below), whose sum is σ = 22507200. Its totient is φ = 19803168.

The previous prime is 21142531. The next prime is 21142613. The reversal of 21142573 is 37524112.

It is a happy number.

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

It is not a de Polignac number, because 21142573 - 2⁹ = 21142061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142273) 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 7 ways as a sum of consecutive naturals, for example, 4561 + ... + 7942.

It is an arithmetic number, because the mean of its divisors is an integer number (2813400).

Almost surely, 2^21142573 is an apocalyptic number.

It is an amenable number.

21142573 is a deficient number, since it is larger than the sum of its proper divisors (1364627).

21142573 is a wasteful number, since it uses less digits than its factorization.

21142573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12611.

The product of its digits is 1680, while the sum is 25.

The square root of 21142573 is about 4598.1053706935. The cubic root of 21142573 is about 276.5153720306.

Adding to 21142573 its reverse (37524112), we get a palindrome (58666685).

The spelling of 21142573 in words is "twenty-one million, one hundred forty-two thousand, five hundred seventy-three".