21150452 has 6 divisors (see below), whose sum is σ = 37013298. Its totient is φ = 10575224.

The previous prime is 21150443. The next prime is 21150487. The reversal of 21150452 is 25405112.

It can be written as a sum of positive squares in only one way, i.e., 20830096 + 320356 = 4564^2 + 566^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2643803 + ... + 2643810.

It is an arithmetic number, because the mean of its divisors is an integer number (6168883).

Almost surely, 2^21150452 is an apocalyptic number.

It is an amenable number.

21150452 is a deficient number, since it is larger than the sum of its proper divisors (15862846).

21150452 is a wasteful number, since it uses less digits than its factorization.

21150452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5287617 (or 5287615 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 21150452 is about 4598.9620568124. The cubic root of 21150452 is about 276.5497165423.

Adding to 21150452 its reverse (25405112), we get a palindrome (46555564).

The spelling of 21150452 in words is "twenty-one million, one hundred fifty thousand, four hundred fifty-two".