19924621 has 2 divisors, whose sum is σ = 19924622. Its totient is φ = 19924620.

The previous prime is 19924579. The next prime is 19924633. The reversal of 19924621 is 12642991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17556100 + 2368521 = 4190^2 + 1539^2 .

It is a cyclic number.

It is not a de Polignac number, because 19924621 - 2¹⁷ = 19793549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19924721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9962310 + 9962311.

It is an arithmetic number, because the mean of its divisors is an integer number (9962311).

Almost surely, 2^19924621 is an apocalyptic number.

It is an amenable number.

19924621 is a deficient number, since it is larger than the sum of its proper divisors (1).

19924621 is an equidigital number, since it uses as much as digits as its factorization.

19924621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 19924621 is about 4463.7003707686. The cubic root of 19924621 is about 271.1003155259.

The spelling of 19924621 in words is "nineteen million, nine hundred twenty-four thousand, six hundred twenty-one".