19089021 has 16 divisors (see below), whose sum is σ = 29177984. Its totient is φ = 10874304.

The previous prime is 19089017. The next prime is 19089029. The reversal of 19089021 is 12098091.

It is not a de Polignac number, because 19089021 - 2² = 19089017 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 19089021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19089029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6615 + ... + 9051.

It is an arithmetic number, because the mean of its divisors is an integer number (1823624).

Almost surely, 2^19089021 is an apocalyptic number.

It is an amenable number.

19089021 is a deficient number, since it is larger than the sum of its proper divisors (10088963).

19089021 is a wasteful number, since it uses less digits than its factorization.

19089021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2820.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 19089021 is about 4369.0984195827. The cubic root of 19089021 is about 267.2562591821.

The spelling of 19089021 in words is "nineteen million, eighty-nine thousand, twenty-one".