21058429 has 4 divisors (see below), whose sum is σ = 24066784. Its totient is φ = 18050076.

The previous prime is 21058417. The next prime is 21058447. The reversal of 21058429 is 92485012.

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 21058429 - 2¹¹ = 21056381 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21058429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21058469) 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 3 ways as a sum of consecutive naturals, for example, 1504167 + ... + 1504180.

It is an arithmetic number, because the mean of its divisors is an integer number (6016696).

Almost surely, 2^21058429 is an apocalyptic number.

It is an amenable number.

21058429 is a deficient number, since it is larger than the sum of its proper divisors (3008355).

21058429 is an equidigital number, since it uses as much as digits as its factorization.

21058429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3008354.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 21058429 is about 4588.9463932367. The cubic root of 21058429 is about 276.1480555845.

The spelling of 21058429 in words is "twenty-one million, fifty-eight thousand, four hundred twenty-nine".