21429035 has 4 divisors (see below), whose sum is σ = 25714848. Its totient is φ = 17143224.

The previous prime is 21429011. The next prime is 21429041. The reversal of 21429035 is 53092412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21429035 - 2⁶ = 21428971 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21428995 and 21429013.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2142899 + ... + 2142908.

It is an arithmetic number, because the mean of its divisors is an integer number (6428712).

Almost surely, 2^21429035 is an apocalyptic number.

21429035 is a deficient number, since it is larger than the sum of its proper divisors (4285813).

21429035 is an equidigital number, since it uses as much as digits as its factorization.

21429035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4285812.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 21429035 is about 4629.1505700290. The cubic root of 21429035 is about 277.7586150633.

The spelling of 21429035 in words is "twenty-one million, four hundred twenty-nine thousand, thirty-five".