21383169 has 16 divisors (see below), whose sum is σ = 30446592. Its totient is φ = 13316688.

The previous prime is 21383143. The next prime is 21383177. The reversal of 21383169 is 96138312.

It is not a de Polignac number, because 21383169 - 2⁵ = 21383137 is a prime.

It is a super-2 number, since 2×21383169² = 914479832965122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21383069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 637 + ... + 6570.

It is an arithmetic number, because the mean of its divisors is an integer number (1902912).

Almost surely, 2^21383169 is an apocalyptic number.

It is an amenable number.

21383169 is a deficient number, since it is larger than the sum of its proper divisors (9063423).

21383169 is a wasteful number, since it uses less digits than its factorization.

21383169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7276.

The product of its digits is 7776, while the sum is 33.

The square root of 21383169 is about 4624.1938756934. The cubic root of 21383169 is about 277.5603050498.

The spelling of 21383169 in words is "twenty-one million, three hundred eighty-three thousand, one hundred sixty-nine".