21360030 has 32 divisors (see below), whose sum is σ = 51434784. Its totient is φ = 5677056.

The previous prime is 21360013. The next prime is 21360083. The reversal of 21360030 is 3006312.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 21359991 and 21360009.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9582 + ... + 11598.

It is an arithmetic number, because the mean of its divisors is an integer number (1607337).

Almost surely, 2^21360030 is an apocalyptic number.

21360030 is an abundant number, since it is smaller than the sum of its proper divisors (30074754).

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

21360030 is a wasteful number, since it uses less digits than its factorization.

21360030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2380.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 21360030 is about 4621.6912488828. The cubic root of 21360030 is about 277.4601517329.

Adding to 21360030 its reverse (3006312), we get a palindrome (24366342).

The spelling of 21360030 in words is "twenty-one million, three hundred sixty thousand, thirty".