21070324 has 12 divisors (see below), whose sum is σ = 40225248. Its totient is φ = 9577400.

The previous prime is 21070321. The next prime is 21070337. The reversal of 21070324 is 42307012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21070321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239392 + ... + 239479.

It is an arithmetic number, because the mean of its divisors is an integer number (3352104).

Almost surely, 2^21070324 is an apocalyptic number.

It is an amenable number.

21070324 is a deficient number, since it is larger than the sum of its proper divisors (19154924).

21070324 is a wasteful number, since it uses less digits than its factorization.

21070324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478886 (or 478884 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 21070324 is about 4590.2422594020. The cubic root of 21070324 is about 276.2000405140.

Adding to 21070324 its reverse (42307012), we get a palindrome (63377336).

The spelling of 21070324 in words is "twenty-one million, seventy thousand, three hundred twenty-four".