21068434 has 8 divisors (see below), whose sum is σ = 31624560. Its totient is φ = 10526916.

The previous prime is 21068417. The next prime is 21068441. The reversal of 21068434 is 43486012.

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

It is a super-2 number, since 2×21068434² = 887757822424712, which contains 22 as substring.

It is an unprimeable number.

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, 1297 + ... + 6619.

It is an arithmetic number, because the mean of its divisors is an integer number (3953070).

Almost surely, 2^21068434 is an apocalyptic number.

21068434 is a deficient number, since it is larger than the sum of its proper divisors (10556126).

21068434 is a wasteful number, since it uses less digits than its factorization.

21068434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7304.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 21068434 is about 4590.0363832981. The cubic root of 21068434 is about 276.1917819210.

It can be divided in two parts, 210 and 68434, that added together give a square (68644 = 262²).

The spelling of 21068434 in words is "twenty-one million, sixty-eight thousand, four hundred thirty-four".