21234602 has 4 divisors (see below), whose sum is σ = 31851906. Its totient is φ = 10617300.

The previous prime is 21234601. The next prime is 21234611. The reversal of 21234602 is 20643212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20349121 + 885481 = 4511^2 + 941^2 .

It is not an unprimeable number, because it can be changed into a prime (21234601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5308649 + ... + 5308652.

Almost surely, 2^21234602 is an apocalyptic number.

21234602 is a deficient number, since it is larger than the sum of its proper divisors (10617304).

21234602 is a wasteful number, since it uses less digits than its factorization.

21234602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10617303.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 21234602 is about 4608.1017783899. The cubic root of 21234602 is about 276.9159949795.

Adding to 21234602 its reverse (20643212), we get a palindrome (41877814).

The spelling of 21234602 in words is "twenty-one million, two hundred thirty-four thousand, six hundred two".