21029230 has 16 divisors (see below), whose sum is σ = 37913904. Its totient is φ = 8398080.

The previous prime is 21029207. The next prime is 21029237. The reversal of 21029230 is 3292012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21029198 and 21029207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21029237) 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 7 ways as a sum of consecutive naturals, for example, 6814 + ... + 9406.

It is an arithmetic number, because the mean of its divisors is an integer number (2369619).

Almost surely, 2^21029230 is an apocalyptic number.

21029230 is a deficient number, since it is larger than the sum of its proper divisors (16884674).

21029230 is a wasteful number, since it uses less digits than its factorization.

21029230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3411.

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

The square root of 21029230 is about 4585.7638404087. The cubic root of 21029230 is about 276.0203636169.

The spelling of 21029230 in words is "twenty-one million, twenty-nine thousand, two hundred thirty".