21327630 has 32 divisors (see below), whose sum is σ = 51840000. Its totient is φ = 5614752.

The previous prime is 21327629. The next prime is 21327637. The reversal of 21327630 is 3672312.

It is a self number, because there is not a number n which added to its sum of digits gives 21327630.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21327637) 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 in 15 ways as a sum of consecutive naturals, for example, 2130 + ... + 6869.

It is an arithmetic number, because the mean of its divisors is an integer number (1620000).

Almost surely, 2^21327630 is an apocalyptic number.

21327630 is an abundant number, since it is smaller than the sum of its proper divisors (30512370).

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

21327630 is a wasteful number, since it uses less digits than its factorization.

21327630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9088.

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 21327630 is about 4618.1847083026. The cubic root of 21327630 is about 277.3197920970.

Adding to 21327630 its reverse (3672312), we get a palindrome (24999942).

The spelling of 21327630 in words is "twenty-one million, three hundred twenty-seven thousand, six hundred thirty".