24661621 has 2 divisors, whose sum is σ = 24661622. Its totient is φ = 24661620.

The previous prime is 24661619. The next prime is 24661627. The reversal of 24661621 is 12616642.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21808900 + 2852721 = 4670^2 + 1689^2 .

It is a cyclic number.

It is not a de Polignac number, because 24661621 - 2¹ = 24661619 is a prime.

Together with 24661619, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 24661621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24661627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12330810 + 12330811.

It is an arithmetic number, because the mean of its divisors is an integer number (12330811).

Almost surely, 2^24661621 is an apocalyptic number.

It is an amenable number.

24661621 is a deficient number, since it is larger than the sum of its proper divisors (1).

24661621 is an equidigital number, since it uses as much as digits as its factorization.

24661621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 28.

The square root of 24661621 is about 4966.0468181442. The cubic root of 24661621 is about 291.0765417074.

The spelling of 24661621 in words is "twenty-four million, six hundred sixty-one thousand, six hundred twenty-one".