19421005 has 8 divisors (see below), whose sum is σ = 23380632. Its totient is φ = 15486528.

The previous prime is 19420979. The next prime is 19421009. The reversal of 19421005 is 50012491.

It can be written as a sum of positive squares in 4 ways, for example, as 34596 + 19386409 = 186^2 + 4403^2 .

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 19421005 - 2¹¹ = 19418957 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 (19421009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4542 + ... + 7711.

It is an arithmetic number, because the mean of its divisors is an integer number (2922579).

Almost surely, 2^19421005 is an apocalyptic number.

It is an amenable number.

19421005 is a deficient number, since it is larger than the sum of its proper divisors (3959627).

19421005 is a wasteful number, since it uses less digits than its factorization.

19421005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12575.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 19421005 is about 4406.9269338168. The cubic root of 19421005 is about 268.7966798310.

Adding to 19421005 its reverse (50012491), we get a palindrome (69433496).

The spelling of 19421005 in words is "nineteen million, four hundred twenty-one thousand, five".