21043211340 has 24 divisors (see below), whose sum is σ = 58920991920. Its totient is φ = 5611523008.

The previous prime is 21043211323. The next prime is 21043211363. The reversal of 21043211340 is 4311234012.

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 7 ways as a sum of consecutive naturals, for example, 175360035 + ... + 175360154.

It is an arithmetic number, because the mean of its divisors is an integer number (2455041330).

Almost surely, 2^21043211340 is an apocalyptic number.

21043211340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21043211340 is an abundant number, since it is smaller than the sum of its proper divisors (37877780580).

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

21043211340 is a wasteful number, since it uses less digits than its factorization.

21043211340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350720201 (or 350720199 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21043211340 its reverse (4311234012), we get a palindrome (25354445352).

The spelling of 21043211340 in words is "twenty-one billion, forty-three million, two hundred eleven thousand, three hundred forty".