19211130 has 48 divisors (see below), whose sum is σ = 50417640. Its totient is φ = 5074944.

The previous prime is 19211123. The next prime is 19211149. The reversal of 19211130 is 3111291.

It can be written as a sum of positive squares in 4 ways, for example, as 9345249 + 9865881 = 3057^2 + 3141^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9226 + ... + 11114.

Almost surely, 2^19211130 is an apocalyptic number.

19211130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19211130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25208820).

19211130 is an abundant number, since it is smaller than the sum of its proper divisors (31206510).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19211130 is a wasteful number, since it uses less digits than its factorization.

19211130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015 (or 2012 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 19211130 is about 4383.0503077195. The cubic root of 19211130 is about 267.8249116265.

The spelling of 19211130 in words is "nineteen million, two hundred eleven thousand, one hundred thirty".