21043662 has 16 divisors (see below), whose sum is σ = 42367872. Its totient is φ = 6967800.

The previous prime is 21043661. The next prime is 21043667. The reversal of 21043662 is 26634012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10708 + ... + 12519.

It is an arithmetic number, because the mean of its divisors is an integer number (2647992).

Almost surely, 2^21043662 is an apocalyptic number.

21043662 is an abundant number, since it is smaller than the sum of its proper divisors (21324210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21043662 is a wasteful number, since it uses less digits than its factorization.

21043662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23383.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 21043662 is about 4587.3371360736. The cubic root of 21043662 is about 276.0834918589.

Adding to 21043662 its reverse (26634012), we get a palindrome (47677674).

The spelling of 21043662 in words is "twenty-one million, forty-three thousand, six hundred sixty-two".