21244652 has 36 divisors (see below), whose sum is σ = 43933176. Its totient is φ = 8910720.

The previous prime is 21244651. The next prime is 21244669. The reversal of 21244652 is 25644212.

It is a super-2 number, since 2×21244652² = 902670477202208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (21244651) 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 11 ways as a sum of consecutive naturals, for example, 6008 + ... + 8864.

It is an arithmetic number, because the mean of its divisors is an integer number (1220366).

Almost surely, 2^21244652 is an apocalyptic number.

21244652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21244652 is an abundant number, since it is smaller than the sum of its proper divisors (22688524).

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

21244652 is a wasteful number, since it uses less digits than its factorization.

21244652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2898 (or 2883 counting only the distinct ones).

The product of its digits is 3840, while the sum is 26.

The square root of 21244652 is about 4609.1921201009. The cubic root of 21244652 is about 276.9596747373.

Adding to 21244652 its reverse (25644212), we get a palindrome (46888864).

It can be divided in two parts, 2124 and 4652, that added together give a palindrome (6776).

The spelling of 21244652 in words is "twenty-one million, two hundred forty-four thousand, six hundred fifty-two".