19480921 has 2 divisors, whose sum is σ = 19480922. Its totient is φ = 19480920.

The previous prime is 19480919. The next prime is 19480939. The reversal of 19480921 is 12908491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14592400 + 4888521 = 3820^2 + 2211^2 .

It is a cyclic number.

It is not a de Polignac number, because 19480921 - 2¹ = 19480919 is a prime.

Together with 19480919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19480991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9740460 + 9740461.

It is an arithmetic number, because the mean of its divisors is an integer number (9740461).

Almost surely, 2^19480921 is an apocalyptic number.

It is an amenable number.

19480921 is a deficient number, since it is larger than the sum of its proper divisors (1).

19480921 is an equidigital number, since it uses as much as digits as its factorization.

19480921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 19480921 is about 4413.7196331439. The cubic root of 19480921 is about 269.0728187856.

The spelling of 19480921 in words is "nineteen million, four hundred eighty thousand, nine hundred twenty-one".