21346844 has 6 divisors (see below), whose sum is σ = 37356984. Its totient is φ = 10673420.

The previous prime is 21346837. The next prime is 21346847. The reversal of 21346844 is 44864312.

It is a self number, because there is not a number n which added to its sum of digits gives 21346844.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21346847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2668352 + ... + 2668359.

It is an arithmetic number, because the mean of its divisors is an integer number (6226164).

Almost surely, 2^21346844 is an apocalyptic number.

It is an amenable number.

21346844 is a deficient number, since it is larger than the sum of its proper divisors (16010140).

21346844 is a wasteful number, since it uses less digits than its factorization.

21346844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5336715 (or 5336713 counting only the distinct ones).

The product of its digits is 18432, while the sum is 32.

The square root of 21346844 is about 4620.2644945934. The cubic root of 21346844 is about 277.4030459664.

The spelling of 21346844 in words is "twenty-one million, three hundred forty-six thousand, eight hundred forty-four".