4919490421 has 2 divisors, whose sum is σ = 4919490422. Its totient is φ = 4919490420.

The previous prime is 4919490419. The next prime is 4919490451. The reversal of 4919490421 is 1240949194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4912467921 + 7022500 = 70089^2 + 2650^2 .

It is a cyclic number.

It is not a de Polignac number, because 4919490421 - 2¹ = 4919490419 is a prime.

Together with 4919490419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4919490451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2459745210 + 2459745211.

It is an arithmetic number, because the mean of its divisors is an integer number (2459745211).

Almost surely, 2^4919490421 is an apocalyptic number.

It is an amenable number.

4919490421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4919490421 is an equidigital number, since it uses as much as digits as its factorization.

4919490421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 4919490421 is about 70139.0791285429. The cubic root of 4919490421 is about 1700.7482773926.

The spelling of 4919490421 in words is "four billion, nine hundred nineteen million, four hundred ninety thousand, four hundred twenty-one".