21124029 has 8 divisors (see below), whose sum is σ = 29647840. Its totient is φ = 13341456.

The previous prime is 21124021. The next prime is 21124031. The reversal of 21124029 is 92042112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21124029 - 2³ = 21124021 is a prime.

It is a super-3 number, since 3×21124029³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21123996 and 21124014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124021) by changing a digit.

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, 185242 + ... + 185355.

It is an arithmetic number, because the mean of its divisors is an integer number (3705980).

Almost surely, 2^21124029 is an apocalyptic number.

It is an amenable number.

21124029 is a deficient number, since it is larger than the sum of its proper divisors (8523811).

21124029 is a wasteful number, since it uses less digits than its factorization.

21124029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370619.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21124029 is about 4596.0884456242. The cubic root of 21124029 is about 276.4345051632.

The spelling of 21124029 in words is "twenty-one million, one hundred twenty-four thousand, twenty-nine".