21241431340 has 24 divisors (see below), whose sum is σ = 45363059280. Its totient is φ = 8352562368.

The previous prime is 21241431287. The next prime is 21241431359. The reversal of 21241431340 is 4313414212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8999427 + ... + 9001786.

It is an arithmetic number, because the mean of its divisors is an integer number (1890127470).

Almost surely, 2^21241431340 is an apocalyptic number.

21241431340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21241431340 is an abundant number, since it is smaller than the sum of its proper divisors (24121627940).

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

21241431340 is a wasteful number, since it uses less digits than its factorization.

21241431340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18001281 (or 18001279 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21241431340 its reverse (4313414212), we get a palindrome (25554845552).

The spelling of 21241431340 in words is "twenty-one billion, two hundred forty-one million, four hundred thirty-one thousand, three hundred forty".