19221503420 has 144 divisors (see below), whose sum is σ = 49117985280. Its totient is φ = 6288137856.

The previous prime is 19221503267. The next prime is 19221503423. The reversal of 19221503420 is 2430512291.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19221503423) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12328601 + ... + 12330159.

It is an arithmetic number, because the mean of its divisors is an integer number (341097120).

Almost surely, 2^19221503420 is an apocalyptic number.

19221503420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19221503420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24558992640).

19221503420 is an abundant number, since it is smaller than the sum of its proper divisors (29896481860).

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

19221503420 is a wasteful number, since it uses less digits than its factorization.

19221503420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152 (or 2143 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 19221503420 in words is "nineteen billion, two hundred twenty-one million, five hundred three thousand, four hundred twenty".