21383030 has 16 divisors (see below), whose sum is σ = 38581920. Its totient is φ = 8532672.

The previous prime is 21383029. The next prime is 21383053. The reversal of 21383030 is 3038312.

It is a junction number, because it is equal to n+sod(n) for n = 21382993 and 21383011.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2231 + ... + 6909.

It is an arithmetic number, because the mean of its divisors is an integer number (2411370).

Almost surely, 2^21383030 is an apocalyptic number.

21383030 is a deficient number, since it is larger than the sum of its proper divisors (17198890).

21383030 is a wasteful number, since it uses less digits than its factorization.

21383030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5143.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21383030 is about 4624.1788460223. The cubic root of 21383030 is about 277.5597036272.

The spelling of 21383030 in words is "twenty-one million, three hundred eighty-three thousand, thirty".