21024413 has 2 divisors, whose sum is σ = 21024414. Its totient is φ = 21024412.

The previous prime is 21024407. The next prime is 21024433. The reversal of 21024413 is 31442012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11648569 + 9375844 = 3413^2 + 3062^2 .

It is a cyclic number.

It is not a de Polignac number, because 21024413 - 2²² = 16830109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21024391 and 21024400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21024403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10512206 + 10512207.

It is an arithmetic number, because the mean of its divisors is an integer number (10512207).

Almost surely, 2^21024413 is an apocalyptic number.

It is an amenable number.

21024413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21024413 is an equidigital number, since it uses as much as digits as its factorization.

21024413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21024413 is about 4585.2385979358. The cubic root of 21024413 is about 275.9992867376. Note that the first 3 decimals are identical.

Adding to 21024413 its reverse (31442012), we get a palindrome (52466425).

The spelling of 21024413 in words is "twenty-one million, twenty-four thousand, four hundred thirteen".