21023169 has 8 divisors (see below), whose sum is σ = 29679840. Its totient is φ = 13190976.

The previous prime is 21023161. The next prime is 21023183. The reversal of 21023169 is 96132012.

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

It is not a de Polignac number, because 21023169 - 2³ = 21023161 is a prime.

It is a super-2 number, since 2×21023169² = 883947269605122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21023161) 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, 206059 + ... + 206160.

It is an arithmetic number, because the mean of its divisors is an integer number (3709980).

Almost surely, 2^21023169 is an apocalyptic number.

It is an amenable number.

21023169 is a deficient number, since it is larger than the sum of its proper divisors (8656671).

21023169 is a wasteful number, since it uses less digits than its factorization.

21023169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412239.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 21023169 is about 4585.1029432282. The cubic root of 21023169 is about 275.9938430679.

The spelling of 21023169 in words is "twenty-one million, twenty-three thousand, one hundred sixty-nine".