21346868 has 6 divisors (see below), whose sum is σ = 37357026. Its totient is φ = 10673432.

The previous prime is 21346867. The next prime is 21346873. The reversal of 21346868 is 86864312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20593444 + 753424 = 4538^2 + 868^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21346867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2668355 + ... + 2668362.

It is an arithmetic number, because the mean of its divisors is an integer number (6226171).

Almost surely, 2^21346868 is an apocalyptic number.

It is an amenable number.

21346868 is a deficient number, since it is larger than the sum of its proper divisors (16010158).

21346868 is a wasteful number, since it uses less digits than its factorization.

21346868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5336721 (or 5336719 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 21346868 is about 4620.2670918465. The cubic root of 21346868 is about 277.4031499266.

The spelling of 21346868 in words is "twenty-one million, three hundred forty-six thousand, eight hundred sixty-eight".