21162524 has 12 divisors (see below), whose sum is σ = 37101624. Its totient is φ = 10562064.

The previous prime is 21162521. The next prime is 21162539. The reversal of 21162524 is 42526112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21162524.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21162521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2159 + ... + 6854.

It is an arithmetic number, because the mean of its divisors is an integer number (3091802).

Almost surely, 2^21162524 is an apocalyptic number.

It is an amenable number.

21162524 is a deficient number, since it is larger than the sum of its proper divisors (15939100).

21162524 is a wasteful number, since it uses less digits than its factorization.

21162524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9604 (or 9602 counting only the distinct ones).

The product of its digits is 960, while the sum is 23.

The square root of 21162524 is about 4600.2743396454. The cubic root of 21162524 is about 276.6023217728.

Adding to 21162524 its reverse (42526112), we get a palindrome (63688636).

The spelling of 21162524 in words is "twenty-one million, one hundred sixty-two thousand, five hundred twenty-four".