19221030 has 64 divisors (see below), whose sum is σ = 51641280. Its totient is φ = 5087232.

The previous prime is 19221029. The next prime is 19221047. The reversal of 19221030 is 3012291.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 19220994 and 19221012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69252 + ... + 69528.

It is an arithmetic number, because the mean of its divisors is an integer number (806895).

Almost surely, 2^19221030 is an apocalyptic number.

19221030 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 19221030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25820640).

19221030 is an abundant number, since it is smaller than the sum of its proper divisors (32420250).

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

19221030 is a wasteful number, since it uses less digits than its factorization.

19221030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550 (or 544 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 19221030 is about 4384.1795127481. The cubic root of 19221030 is about 267.8709094639.

The spelling of 19221030 in words is "nineteen million, two hundred twenty-one thousand, thirty".