21032842 has 12 divisors (see below), whose sum is σ = 33515190. Its totient is φ = 9897536.

The previous prime is 21032813. The next prime is 21032857. The reversal of 21032842 is 24823012.

It can be written as a sum of positive squares in 3 ways, for example, as 20151121 + 881721 = 4489^2 + 939^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17617 + ... + 18772.

Almost surely, 2^21032842 is an apocalyptic number.

21032842 is a deficient number, since it is larger than the sum of its proper divisors (12482348).

21032842 is a wasteful number, since it uses less digits than its factorization.

21032842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36425 (or 36408 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 21032842 is about 4586.1576510190. The cubic root of 21032842 is about 276.0361658832.

Adding to 21032842 its reverse (24823012), we get a palindrome (45855854).

The spelling of 21032842 in words is "twenty-one million, thirty-two thousand, eight hundred forty-two".