21070426 has 8 divisors (see below), whose sum is σ = 34036884. Its totient is φ = 9724800.

The previous prime is 21070403. The next prime is 21070447. The reversal of 21070426 is 62407012.

It can be written as a sum of positive squares in 2 ways, for example, as 17264025 + 3806401 = 4155^2 + 1951^2 .

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 = 21070397 and 21070406.

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, 405175 + ... + 405226.

Almost surely, 2^21070426 is an apocalyptic number.

21070426 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21070426 is a deficient number, since it is larger than the sum of its proper divisors (12966458).

21070426 is a wasteful number, since it uses less digits than its factorization.

21070426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810416.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21070426 is about 4590.2533699133. The cubic root of 21070426 is about 276.2004862018.

Adding to 21070426 its reverse (62407012), we get a palindrome (83477438).

The spelling of 21070426 in words is "twenty-one million, seventy thousand, four hundred twenty-six".