21344776 has 8 divisors (see below), whose sum is σ = 40021470. Its totient is φ = 10672384.

The previous prime is 21344767. The next prime is 21344777. The reversal of 21344776 is 67744312.

It can be written as a sum of positive squares in only one way, i.e., 21068100 + 276676 = 4590^2 + 526^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1334041 + ... + 1334056.

Almost surely, 2^21344776 is an apocalyptic number.

It is an amenable number.

21344776 is a deficient number, since it is larger than the sum of its proper divisors (18676694).

21344776 is a wasteful number, since it uses less digits than its factorization.

21344776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2668103 (or 2668099 counting only the distinct ones).

The product of its digits is 28224, while the sum is 34.

The square root of 21344776 is about 4620.0406924615. The cubic root of 21344776 is about 277.3940877643.

The spelling of 21344776 in words is "twenty-one million, three hundred forty-four thousand, seven hundred seventy-six".