21168469 has 8 divisors (see below), whose sum is σ = 24295680. Its totient is φ = 18067056.

The previous prime is 21168461. The next prime is 21168479. The reversal of 21168469 is 96486112.

It is a happy number.

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

It is not a de Polignac number, because 21168469 - 2³ = 21168461 is a prime.

It is a super-2 number, since 2×21168469² = 896208159607922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21168461) 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, 4654 + ... + 7999.

It is an arithmetic number, because the mean of its divisors is an integer number (3036960).

Almost surely, 2^21168469 is an apocalyptic number.

It is an amenable number.

21168469 is a deficient number, since it is larger than the sum of its proper divisors (3127211).

21168469 is a wasteful number, since it uses less digits than its factorization.

21168469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12899.

The product of its digits is 20736, while the sum is 37.

The square root of 21168469 is about 4600.9204513880. The cubic root of 21168469 is about 276.6282204928.

It can be divided in two parts, 2116 and 8469, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 21168469 in words is "twenty-one million, one hundred sixty-eight thousand, four hundred sixty-nine".