21924073 has 2 divisors, whose sum is σ = 21924074. Its totient is φ = 21924072.

The previous prime is 21924061. The next prime is 21924107. The reversal of 21924073 is 37042912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15303744 + 6620329 = 3912^2 + 2573^2 .

It is a cyclic number.

It is not a de Polignac number, because 21924073 - 2⁵ = 21924041 is a prime.

It is not a weakly prime, because it can be changed into another prime (21924173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10962036 + 10962037.

It is an arithmetic number, because the mean of its divisors is an integer number (10962037).

Almost surely, 2^21924073 is an apocalyptic number.

It is an amenable number.

21924073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21924073 is an equidigital number, since it uses as much as digits as its factorization.

21924073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 21924073 is about 4682.3149189263. The cubic root of 21924073 is about 279.8812123676.

Adding to 21924073 its reverse (37042912), we get a palindrome (58966985).

The spelling of 21924073 in words is "twenty-one million, nine hundred twenty-four thousand, seventy-three".