21431124330 has 192 divisors, whose sum is σ = 64778192640. Its totient is φ = 4441789440.

The previous prime is 21431124313. The next prime is 21431124367. The reversal of 21431124330 is 3342113412.

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 21431124330.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12932862 + ... + 12934518.

It is an arithmetic number, because the mean of its divisors is an integer number (337386420).

Almost surely, 2^21431124330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21431124330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32389096320).

21431124330 is an abundant number, since it is smaller than the sum of its proper divisors (43347068310).

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

21431124330 is a wasteful number, since it uses less digits than its factorization.

21431124330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2205 (or 2194 counting only the distinct ones).

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

Adding to 21431124330 its reverse (3342113412), we get a palindrome (24773237742).

The spelling of 21431124330 in words is "twenty-one billion, four hundred thirty-one million, one hundred twenty-four thousand, three hundred thirty".