19741921 has 2 divisors, whose sum is σ = 19741922. Its totient is φ = 19741920.

The previous prime is 19741877. The next prime is 19741933. The reversal of 19741921 is 12914791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18662400 + 1079521 = 4320^2 + 1039^2 .

It is a cyclic number.

It is not a de Polignac number, because 19741921 - 2²³ = 11353313 is a prime.

It is not a weakly prime, because it can be changed into another prime (19741991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9870960 + 9870961.

It is an arithmetic number, because the mean of its divisors is an integer number (9870961).

Almost surely, 2^19741921 is an apocalyptic number.

It is an amenable number.

19741921 is a deficient number, since it is larger than the sum of its proper divisors (1).

19741921 is an equidigital number, since it uses as much as digits as its factorization.

19741921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 34.

The square root of 19741921 is about 4443.1881571682. The cubic root of 19741921 is about 270.2691463388.

The spelling of 19741921 in words is "nineteen million, seven hundred forty-one thousand, nine hundred twenty-one".