21070024 has 32 divisors (see below), whose sum is σ = 41469120. Its totient is φ = 10017216.

The previous prime is 21070013. The next prime is 21070033. The reversal of 21070024 is 42007012.

It is a super-2 number, since 2×21070024² = 887891822721152, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 56302 + ... + 56674.

It is an arithmetic number, because the mean of its divisors is an integer number (1295910).

Almost surely, 2^21070024 is an apocalyptic number.

It is an amenable number.

21070024 is a deficient number, since it is larger than the sum of its proper divisors (20399096).

21070024 is a wasteful number, since it uses less digits than its factorization.

21070024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709 (or 705 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 21070024 is about 4590.2095812719. The cubic root of 21070024 is about 276.1987296592.

Adding to 21070024 its reverse (42007012), we get a palindrome (63077036).

The spelling of 21070024 in words is "twenty-one million, seventy thousand, twenty-four".