21843969 has 8 divisors (see below), whose sum is σ = 33286080. Its totient is φ = 12482256.

The previous prime is 21843953. The next prime is 21843979. The reversal of 21843969 is 96934812.

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

It is not a de Polignac number, because 21843969 - 2⁴ = 21843953 is a prime.

It is a super-2 number, since 2×21843969² = 954317963345922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21843969.

It is not an unprimeable number, because it can be changed into a prime (21843919) 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, 520074 + ... + 520115.

It is an arithmetic number, because the mean of its divisors is an integer number (4160760).

Almost surely, 2^21843969 is an apocalyptic number.

It is an amenable number.

21843969 is a deficient number, since it is larger than the sum of its proper divisors (11442111).

21843969 is a wasteful number, since it uses less digits than its factorization.

21843969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040199.

The product of its digits is 93312, while the sum is 42.

The square root of 21843969 is about 4673.7532027269. The cubic root of 21843969 is about 279.5399289902.

The spelling of 21843969 in words is "twenty-one million, eight hundred forty-three thousand, nine hundred sixty-nine".