1019425021 has 8 divisors (see below), whose sum is σ = 1070527104. Its totient is φ = 968887920.

The previous prime is 1019425019. The next prime is 1019425051. The reversal of 1019425021 is 1205249101.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1019425021 - 2¹ = 1019425019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1019425051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137545 + ... + 144766.

It is an arithmetic number, because the mean of its divisors is an integer number (133815888).

Almost surely, 2^1019425021 is an apocalyptic number.

It is an amenable number.

1019425021 is a deficient number, since it is larger than the sum of its proper divisors (51102083).

1019425021 is a wasteful number, since it uses less digits than its factorization.

1019425021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282491.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1019425021 is about 31928.4359310004. The cubic root of 1019425021 is about 1006.4335279562.

The spelling of 1019425021 in words is "one billion, nineteen million, four hundred twenty-five thousand, twenty-one".