19008021 has 16 divisors (see below), whose sum is σ = 26832960. Its totient is φ = 11948160.

The previous prime is 19008013. The next prime is 19008043. The reversal of 19008021 is 12080091.

It is not a de Polignac number, because 19008021 - 2³ = 19008013 is a prime.

It is a super-2 number, since 2×19008021² = 722609724672882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19008061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1201 + ... + 6281.

It is an arithmetic number, because the mean of its divisors is an integer number (1677060).

Almost surely, 2^19008021 is an apocalyptic number.

It is an amenable number.

19008021 is a deficient number, since it is larger than the sum of its proper divisors (7824939).

19008021 is a wasteful number, since it uses less digits than its factorization.

19008021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5156.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 19008021 is about 4359.8189182580. The cubic root of 19008021 is about 266.8777091502.

The spelling of 19008021 in words is "nineteen million, eight thousand, twenty-one".