21152234 has 8 divisors (see below), whose sum is σ = 32585988. Its totient is φ = 10290240.

The previous prime is 21152207. The next prime is 21152237. The reversal of 21152234 is 43225112.

It can be written as a sum of positive squares in 2 ways, for example, as 18037009 + 3115225 = 4247^2 + 1765^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21152237) 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, 142847 + ... + 142994.

Almost surely, 2^21152234 is an apocalyptic number.

21152234 is a deficient number, since it is larger than the sum of its proper divisors (11433754).

21152234 is a wasteful number, since it uses less digits than its factorization.

21152234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285880.

The product of its digits is 480, while the sum is 20.

The square root of 21152234 is about 4599.1557920992. The cubic root of 21152234 is about 276.5574830865.

Adding to 21152234 its reverse (43225112), we get a palindrome (64377346).

The spelling of 21152234 in words is "twenty-one million, one hundred fifty-two thousand, two hundred thirty-four".