21320452 has 12 divisors (see below), whose sum is σ = 38597580. Its totient is φ = 10292576.

The previous prime is 21320447. The next prime is 21320479. The reversal of 21320452 is 25402312.

It can be written as a sum of positive squares in 2 ways, for example, as 10653696 + 10666756 = 3264^2 + 3266^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91783 + ... + 92014.

It is an arithmetic number, because the mean of its divisors is an integer number (3216465).

Almost surely, 2^21320452 is an apocalyptic number.

It is an amenable number.

21320452 is a deficient number, since it is larger than the sum of its proper divisors (17277128).

21320452 is a wasteful number, since it uses less digits than its factorization.

21320452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183830 (or 183828 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21320452 is about 4617.4074977199. The cubic root of 21320452 is about 277.2886771407.

Adding to 21320452 its reverse (25402312), we get a palindrome (46722764).

The spelling of 21320452 in words is "twenty-one million, three hundred twenty thousand, four hundred fifty-two".