21970024 has 16 divisors (see below), whose sum is σ = 41267520. Its totient is φ = 10965360.

The previous prime is 21970021. The next prime is 21970043. The reversal of 21970024 is 42007912.

It is not an unprimeable number, because it can be changed into a prime (21970021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3009 + ... + 7279.

It is an arithmetic number, because the mean of its divisors is an integer number (2579220).

Almost surely, 2^21970024 is an apocalyptic number.

It is an amenable number.

21970024 is a deficient number, since it is larger than the sum of its proper divisors (19297496).

21970024 is a wasteful number, since it uses less digits than its factorization.

21970024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4920 (or 4916 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 21970024 is about 4687.2192182572. The cubic root of 21970024 is about 280.0766116892.

Adding to 21970024 its reverse (42007912), we get a palindrome (63977936).

The spelling of 21970024 in words is "twenty-one million, nine hundred seventy thousand, twenty-four".