19010421 has 12 divisors (see below), whose sum is σ = 27605760. Its totient is φ = 12606120.

The previous prime is 19010413. The next prime is 19010423. The reversal of 19010421 is 12401091.

It is not a de Polignac number, because 19010421 - 2³ = 19010413 is a prime.

It is a super-2 number, since 2×19010421² = 722792213194482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19010394 and 19010403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19010423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3811 + ... + 7248.

It is an arithmetic number, because the mean of its divisors is an integer number (2300480).

Almost surely, 2^19010421 is an apocalyptic number.

It is an amenable number.

19010421 is a deficient number, since it is larger than the sum of its proper divisors (8595339).

19010421 is a wasteful number, since it uses less digits than its factorization.

19010421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11256 (or 11253 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 19010421 is about 4360.0941503596. The cubic root of 19010421 is about 266.8889408919. Note that the first 3 decimals are identical.

The spelling of 19010421 in words is "nineteen million, ten thousand, four hundred twenty-one".