19149221 has 12 divisors (see below), whose sum is σ = 23699232. Its totient is φ = 15150096.

The previous prime is 19149211. The next prime is 19149223. The reversal of 19149221 is 12294191.

It is not a de Polignac number, because 19149221 - 2¹⁰ = 19148197 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 (19149223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6911 + ... + 9276.

It is an arithmetic number, because the mean of its divisors is an integer number (1974936).

Almost surely, 2^19149221 is an apocalyptic number.

It is an amenable number.

19149221 is a deficient number, since it is larger than the sum of its proper divisors (4550011).

19149221 is a wasteful number, since it uses less digits than its factorization.

19149221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16220 (or 16207 counting only the distinct ones).

The product of its digits is 1296, while the sum is 29.

The square root of 19149221 is about 4375.9822897265. The cubic root of 19149221 is about 267.5369081749.

The spelling of 19149221 in words is "nineteen million, one hundred forty-nine thousand, two hundred twenty-one".