21923316 has 36 divisors (see below), whose sum is σ = 55579524. Its totient is φ = 7286400.

The previous prime is 21923311. The next prime is 21923381. The reversal of 21923316 is 61332912.

It can be written as a sum of positive squares in 2 ways, for example, as 14470416 + 7452900 = 3804^2 + 2730^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21923316.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21923311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15936 + ... + 17256.

Almost surely, 2^21923316 is an apocalyptic number.

It is an amenable number.

21923316 is an abundant number, since it is smaller than the sum of its proper divisors (33656208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21923316 is a wasteful number, since it uses less digits than its factorization.

21923316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1792 (or 1787 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 21923316 is about 4682.2340821450. The cubic root of 21923316 is about 279.8779910605.

The spelling of 21923316 in words is "twenty-one million, nine hundred twenty-three thousand, three hundred sixteen".