21836469 has 16 divisors (see below), whose sum is σ = 29696000. Its totient is φ = 14270256.

The previous prime is 21836467. The next prime is 21836471. The reversal of 21836469 is 96463812.

It is an interprime number because it is at equal distance from previous prime (21836467) and next prime (21836471).

It is not a de Polignac number, because 21836469 - 2¹ = 21836467 is a prime.

It is a super-2 number, since 2×21836469² = 953662756775922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21836461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46932 + ... + 47394.

It is an arithmetic number, because the mean of its divisors is an integer number (1856000).

Almost surely, 2^21836469 is an apocalyptic number.

It is an amenable number.

21836469 is a deficient number, since it is larger than the sum of its proper divisors (7859531).

21836469 is a wasteful number, since it uses less digits than its factorization.

21836469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744.

The product of its digits is 62208, while the sum is 39.

The square root of 21836469 is about 4672.9507808236. The cubic root of 21836469 is about 279.5079325238.

The spelling of 21836469 in words is "twenty-one million, eight hundred thirty-six thousand, four hundred sixty-nine".