21468643 has 8 divisors (see below), whose sum is σ = 24872288. Its totient is φ = 18149184.

The previous prime is 21468607. The next prime is 21468649. The reversal of 21468643 is 34686412.

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

It is a cyclic number.

It is not a de Polignac number, because 21468643 - 2¹⁷ = 21337571 is a prime.

It is a super-2 number, since 2×21468643² = 921805264522898, which contains 22 as substring.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 21468599 and 21468608.

It is not an unprimeable number, because it can be changed into a prime (21468649) 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, 20496 + ... + 21517.

It is an arithmetic number, because the mean of its divisors is an integer number (3109036).

Almost surely, 2^21468643 is an apocalyptic number.

21468643 is a deficient number, since it is larger than the sum of its proper divisors (3403645).

21468643 is an equidigital number, since it uses as much as digits as its factorization.

21468643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42093.

The product of its digits is 27648, while the sum is 34.

The square root of 21468643 is about 4633.4267016971. The cubic root of 21468643 is about 277.9296399065.

The spelling of 21468643 in words is "twenty-one million, four hundred sixty-eight thousand, six hundred forty-three".