19000221 has 16 divisors (see below), whose sum is σ = 25965120. Its totient is φ = 12355200.

The previous prime is 19000213. The next prime is 19000229. The reversal of 19000221 is 12200091.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19000213) and next prime (19000229).

It is not a de Polignac number, because 19000221 - 2³ = 19000213 is a prime.

It is a super-2 number, since 2×19000221² = 722016796097682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19000221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19000229) 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, 21690 + ... + 22548.

It is an arithmetic number, because the mean of its divisors is an integer number (1622820).

Almost surely, 2^19000221 is an apocalyptic number.

It is an amenable number.

19000221 is a deficient number, since it is larger than the sum of its proper divisors (6964899).

19000221 is a wasteful number, since it uses less digits than its factorization.

19000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 19000221 is about 4358.9242939056. The cubic root of 19000221 is about 266.8411994590.

The spelling of 19000221 in words is "nineteen million, two hundred twenty-one", and thus it is an aban number.