21489952 has 24 divisors (see below), whose sum is σ = 46155312. Its totient is φ = 9768000.

The previous prime is 21489947. The next prime is 21489953. The reversal of 21489952 is 25998412.

It is not an unprimeable number, because it can be changed into a prime (21489953) 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, 30174 + ... + 30877.

It is an arithmetic number, because the mean of its divisors is an integer number (1923138).

Almost surely, 2^21489952 is an apocalyptic number.

21489952 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21489952 is an abundant number, since it is smaller than the sum of its proper divisors (24665360).

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

21489952 is a wasteful number, since it uses less digits than its factorization.

21489952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61072 (or 61064 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 21489952 is about 4635.7256174196. The cubic root of 21489952 is about 278.0215638087.

It can be divided in two parts, 2148 and 9952, that added together give a square (12100 = 110²).

The spelling of 21489952 in words is "twenty-one million, four hundred eighty-nine thousand, nine hundred fifty-two".