21724446030 has 256 divisors, whose sum is σ = 65259509760. Its totient is φ = 4514807808.

The previous prime is 21724446019. The next prime is 21724446061. The reversal of 21724446030 is 3064442712.

It is a super-3 number, since 3×21724446030³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21724445982 and 21724446000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 21530166 + ... + 21531174.

It is an arithmetic number, because the mean of its divisors is an integer number (254919960).

Almost surely, 2^21724446030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21724446030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32629754880).

21724446030 is an abundant number, since it is smaller than the sum of its proper divisors (43535063730).

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

21724446030 is a wasteful number, since it uses less digits than its factorization.

21724446030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243.

The product of its (nonzero) digits is 32256, while the sum is 33.

Adding to 21724446030 its reverse (3064442712), we get a palindrome (24788888742).

The spelling of 21724446030 in words is "twenty-one billion, seven hundred twenty-four million, four hundred forty-six thousand, thirty".