21030229 has 4 divisors (see below), whose sum is σ = 22942080. Its totient is φ = 19118380.

The previous prime is 21030227. The next prime is 21030239. The reversal of 21030229 is 92203012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21030229 - 2¹ = 21030227 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030227) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 955909 + ... + 955930.

It is an arithmetic number, because the mean of its divisors is an integer number (5735520).

Almost surely, 2^21030229 is an apocalyptic number.

It is an amenable number.

21030229 is a deficient number, since it is larger than the sum of its proper divisors (1911851).

21030229 is a wasteful number, since it uses less digits than its factorization.

21030229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911850.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 21030229 is about 4585.8727631717. The cubic root of 21030229 is about 276.0247343583.

The spelling of 21030229 in words is "twenty-one million, thirty thousand, two hundred twenty-nine".