21843386 has 4 divisors (see below), whose sum is σ = 32765082. Its totient is φ = 10921692.

The previous prime is 21843383. The next prime is 21843397. The reversal of 21843386 is 68334812.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19936225 + 1907161 = 4465^2 + 1381^2 .

It is not an unprimeable number, because it can be changed into a prime (21843383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5460845 + ... + 5460848.

Almost surely, 2^21843386 is an apocalyptic number.

21843386 is a deficient number, since it is larger than the sum of its proper divisors (10921696).

21843386 is a wasteful number, since it uses less digits than its factorization.

21843386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10921695.

The product of its digits is 27648, while the sum is 35.

The square root of 21843386 is about 4673.6908327359. The cubic root of 21843386 is about 279.5374420608.

The spelling of 21843386 in words is "twenty-one million, eight hundred forty-three thousand, three hundred eighty-six".