21230604 has 36 divisors (see below), whose sum is σ = 54206880. Its totient is φ = 7005600.

The previous prime is 21230597. The next prime is 21230611. The reversal of 21230604 is 40603212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21230597) and next prime (21230611).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 717 + ... + 6555.

Almost surely, 2^21230604 is an apocalyptic number.

It is an amenable number.

21230604 is an abundant number, since it is smaller than the sum of its proper divisors (32976276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21230604 is a wasteful number, since it uses less digits than its factorization.

21230604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5950 (or 5945 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21230604 is about 4607.6679567868. The cubic root of 21230604 is about 276.8986148620.

Adding to 21230604 its reverse (40603212), we get a palindrome (61833816).

The spelling of 21230604 in words is "twenty-one million, two hundred thirty thousand, six hundred four".