24940021 has 2 divisors, whose sum is σ = 24940022. Its totient is φ = 24940020.

The previous prime is 24940007. The next prime is 24940049. The reversal of 24940021 is 12004942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24700900 + 239121 = 4970^2 + 489^2 .

It is a cyclic number.

It is not a de Polignac number, because 24940021 - 2¹⁹ = 24415733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 24939974 and 24940001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24940001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12470010 + 12470011.

It is an arithmetic number, because the mean of its divisors is an integer number (12470011).

Almost surely, 2^24940021 is an apocalyptic number.

It is an amenable number.

24940021 is a deficient number, since it is larger than the sum of its proper divisors (1).

24940021 is an equidigital number, since it uses as much as digits as its factorization.

24940021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 24940021 is about 4993.9984981976. The cubic root of 24940021 is about 292.1677470189.

Adding to 24940021 its reverse (12004942), we get a palindrome (36944963).

The spelling of 24940021 in words is "twenty-four million, nine hundred forty thousand, twenty-one".