21431282260 has 24 divisors (see below), whose sum is σ = 45547933536. Its totient is φ = 8469228960.

The previous prime is 21431282251. The next prime is 21431282261. The reversal of 21431282260 is 6228213412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431282261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6453546 + ... + 6456865.

It is an arithmetic number, because the mean of its divisors is an integer number (1897830564).

Almost surely, 2^21431282260 is an apocalyptic number.

21431282260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21431282260 is an abundant number, since it is smaller than the sum of its proper divisors (24116651276).

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

21431282260 is a wasteful number, since it uses less digits than its factorization.

21431282260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12910503 (or 12910501 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

Adding to 21431282260 its reverse (6228213412), we get a palindrome (27659495672).

The spelling of 21431282260 in words is "twenty-one billion, four hundred thirty-one million, two hundred eighty-two thousand, two hundred sixty".