21434668 has 24 divisors (see below), whose sum is σ = 38528784. Its totient is φ = 10430400.

The previous prime is 21434657. The next prime is 21434669. The reversal of 21434668 is 86643412.

It is not an unprimeable number, because it can be changed into a prime (21434669) 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, 25698 + ... + 26518.

It is an arithmetic number, because the mean of its divisors is an integer number (1605366).

Almost surely, 2^21434668 is an apocalyptic number.

It is an amenable number.

21434668 is a deficient number, since it is larger than the sum of its proper divisors (17094116).

21434668 is a wasteful number, since it uses less digits than its factorization.

21434668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993 (or 991 counting only the distinct ones).

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

The square root of 21434668 is about 4629.7589570085. The cubic root of 21434668 is about 277.7829508488.

The spelling of 21434668 in words is "twenty-one million, four hundred thirty-four thousand, six hundred sixty-eight".