21031034 has 8 divisors (see below), whose sum is σ = 31636980. Its totient is φ = 10485376.

The previous prime is 21031033. The next prime is 21031063. The reversal of 21031034 is 43013012.

It can be written as a sum of positive squares in 2 ways, for example, as 18619225 + 2411809 = 4315^2 + 1553^2 .

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

It is a super-2 number, since 2×21031034² = 884608782218312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21031033) 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, 14189 + ... + 15600.

Almost surely, 2^21031034 is an apocalyptic number.

21031034 is a deficient number, since it is larger than the sum of its proper divisors (10605946).

21031034 is a wasteful number, since it uses less digits than its factorization.

21031034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30144.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21031034 is about 4585.9605318842. The cubic root of 21031034 is about 276.0282562263.

Adding to 21031034 its reverse (43013012), we get a palindrome (64044046).

The spelling of 21031034 in words is "twenty-one million, thirty-one thousand, thirty-four".