21170029 has 8 divisors (see below), whose sum is σ = 21951360. Its totient is φ = 20392176.

The previous prime is 21169997. The next prime is 21170033. The reversal of 21170029 is 92007112.

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

It is a cyclic number.

It is not a de Polignac number, because 21170029 - 2⁵ = 21169997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21169991 and 21170009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21170099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23424 + ... + 24310.

It is an arithmetic number, because the mean of its divisors is an integer number (2743920).

Almost surely, 2^21170029 is an apocalyptic number.

21170029 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21170029 is a deficient number, since it is larger than the sum of its proper divisors (781331).

21170029 is an equidigital number, since it uses as much as digits as its factorization.

21170029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 21170029 is about 4601.0899795592. The cubic root of 21170029 is about 276.6350156531.

The spelling of 21170029 in words is "twenty-one million, one hundred seventy thousand, twenty-nine".