21431430360 has 640 divisors, whose sum is σ = 79787980800. Its totient is φ = 5141283840.

The previous prime is 21431430359. The next prime is 21431430401. The reversal of 21431430360 is 6303413412.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 101570655 + ... + 101570865.

It is an arithmetic number, because the mean of its divisors is an integer number (124668720).

Almost surely, 2^21431430360 is an apocalyptic number.

21431430360 is a gapful number since it is divisible by the number (20) 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 21431430360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39893990400).

21431430360 is an abundant number, since it is smaller than the sum of its proper divisors (58356550440).

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

21431430360 is a wasteful number, since it uses less digits than its factorization.

21431430360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

Adding to 21431430360 its reverse (6303413412), we get a palindrome (27734843772).

The spelling of 21431430360 in words is "twenty-one billion, four hundred thirty-one million, four hundred thirty thousand, three hundred sixty".