21945076 has 12 divisors (see below), whose sum is σ = 40425280. Its totient is φ = 10395000.

The previous prime is 21945073. The next prime is 21945089. The reversal of 21945076 is 67054912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21945073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144300 + ... + 144451.

Almost surely, 2^21945076 is an apocalyptic number.

It is an amenable number.

21945076 is a deficient number, since it is larger than the sum of its proper divisors (18480204).

21945076 is a wasteful number, since it uses less digits than its factorization.

21945076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288774 (or 288772 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 21945076 is about 4684.5571829149. The cubic root of 21945076 is about 279.9705581288.

Adding to 21945076 its reverse (67054912), we get a palindrome (88999988).

It can be divided in two parts, 219450 and 76, that multiplied together give a triangular number (16678200 = T₅₇₇₅).

The spelling of 21945076 in words is "twenty-one million, nine hundred forty-five thousand, seventy-six".