21443123130 has 128 divisors (see below), whose sum is σ = 60569752320. Its totient is φ = 4789800960.

The previous prime is 21443123129. The next prime is 21443123167. The reversal of 21443123130 is 3132134412.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21443123130.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2539756 + ... + 2548184.

It is an arithmetic number, because the mean of its divisors is an integer number (473201190).

Almost surely, 2^21443123130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21443123130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30284876160).

21443123130 is an abundant number, since it is smaller than the sum of its proper divisors (39126629190).

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

21443123130 is a wasteful number, since it uses less digits than its factorization.

21443123130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9056.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21443123130 its reverse (3132134412), we get a palindrome (24575257542).

The spelling of 21443123130 in words is "twenty-one billion, four hundred forty-three million, one hundred twenty-three thousand, one hundred thirty".