21203452 has 6 divisors (see below), whose sum is σ = 37106048. Its totient is φ = 10601724.

The previous prime is 21203431. The next prime is 21203459. The reversal of 21203452 is 25430212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203459) 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 as a sum of consecutive naturals, namely, 2650428 + ... + 2650435.

Almost surely, 2^21203452 is an apocalyptic number.

It is an amenable number.

21203452 is a deficient number, since it is larger than the sum of its proper divisors (15902596).

21203452 is a wasteful number, since it uses less digits than its factorization.

21203452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5300867 (or 5300865 counting only the distinct ones).

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

The square root of 21203452 is about 4604.7206212755. The cubic root of 21203452 is about 276.7805218399.

Adding to 21203452 its reverse (25430212), we get a palindrome (46633664).

The spelling of 21203452 in words is "twenty-one million, two hundred three thousand, four hundred fifty-two".