21343688 has 16 divisors (see below), whose sum is σ = 42126000. Its totient is φ = 10110096.

The previous prime is 21343661. The next prime is 21343691. The reversal of 21343688 is 88634312.

It is a happy number.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70058 + ... + 70361.

It is an arithmetic number, because the mean of its divisors is an integer number (2632875).

Almost surely, 2^21343688 is an apocalyptic number.

It is an amenable number.

21343688 is a deficient number, since it is larger than the sum of its proper divisors (20782312).

21343688 is a wasteful number, since it uses less digits than its factorization.

21343688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140444 (or 140440 counting only the distinct ones).

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

The square root of 21343688 is about 4619.9229430803. The cubic root of 21343688 is about 277.3893745128.

The spelling of 21343688 in words is "twenty-one million, three hundred forty-three thousand, six hundred eighty-eight".