21200030 has 16 divisors (see below), whose sum is σ = 38229840. Its totient is φ = 8464512.

The previous prime is 21200021. The next prime is 21200041. The reversal of 21200030 is 3000212.

It is a junction number, because it is equal to n+sod(n) for n = 21199990 and 21200017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4982 + ... + 8198.

It is an arithmetic number, because the mean of its divisors is an integer number (2389365).

Almost surely, 2^21200030 is an apocalyptic number.

21200030 is a deficient number, since it is larger than the sum of its proper divisors (17029810).

21200030 is a wasteful number, since it uses less digits than its factorization.

21200030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3883.

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 21200030 is about 4604.3490310792. The cubic root of 21200030 is about 276.7656312786.

Adding to 21200030 its reverse (3000212), we get a palindrome (24200242).

The spelling of 21200030 in words is "twenty-one million, two hundred thousand, thirty".