21070624 has 24 divisors (see below), whose sum is σ = 41595120. Its totient is φ = 10506816.

The previous prime is 21070613. The next prime is 21070657. The reversal of 21070624 is 42607012.

It is a junction number, because it is equal to n+sod(n) for n = 21070595 and 21070604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16107 + ... + 17365.

It is an arithmetic number, because the mean of its divisors is an integer number (1733130).

Almost surely, 2^21070624 is an apocalyptic number.

It is an amenable number.

21070624 is a deficient number, since it is larger than the sum of its proper divisors (20524496).

21070624 is a wasteful number, since it uses less digits than its factorization.

21070624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1792 (or 1784 counting only the distinct ones).

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

The square root of 21070624 is about 4590.2749372995. The cubic root of 21070624 is about 276.2013513563.

Adding to 21070624 its reverse (42607012), we get a palindrome (63677636).

It can be divided in two parts, 2107062 and 4, that multiplied together give a palindrome (8428248).

The spelling of 21070624 in words is "twenty-one million, seventy thousand, six hundred twenty-four".