21162484 has 48 divisors (see below), whose sum is σ = 46787328. Its totient is φ = 8160768.

The previous prime is 21162469. The next prime is 21162487. The reversal of 21162484 is 48426112.

It is a super-3 number, since 3×21162484³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21162487) 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 15 ways as a sum of consecutive naturals, for example, 9982 + ... + 11914.

It is an arithmetic number, because the mean of its divisors is an integer number (974736).

Almost surely, 2^21162484 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21162484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23393664).

21162484 is an abundant number, since it is smaller than the sum of its proper divisors (25624844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21162484 is a wasteful number, since it uses less digits than its factorization.

21162484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984 (or 1982 counting only the distinct ones).

The product of its digits is 3072, while the sum is 28.

The square root of 21162484 is about 4600.2699920766. The cubic root of 21162484 is about 276.6021475009.

Adding to 21162484 its reverse (48426112), we get a palindrome (69588596).

The spelling of 21162484 in words is "twenty-one million, one hundred sixty-two thousand, four hundred eighty-four".