21042034 has 8 divisors (see below), whose sum is σ = 33991020. Its totient is φ = 9711696.

The previous prime is 21042017. The next prime is 21042053. The reversal of 21042034 is 43024012.

It can be written as a sum of positive squares in 2 ways, for example, as 20223009 + 819025 = 4497^2 + 905^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21041999 and 21042017.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404629 + ... + 404680.

Almost surely, 2^21042034 is an apocalyptic number.

21042034 is a deficient number, since it is larger than the sum of its proper divisors (12948986).

21042034 is a wasteful number, since it uses less digits than its factorization.

21042034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809324.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 21042034 is about 4587.1596876499. The cubic root of 21042034 is about 276.0763721298.

Adding to 21042034 its reverse (43024012), we get a palindrome (64066046).

The spelling of 21042034 in words is "twenty-one million, forty-two thousand, thirty-four".