21321451046 has 48 divisors (see below), whose sum is σ = 39185156160. Its totient is φ = 8651679120.

The previous prime is 21321451013. The next prime is 21321451069. The reversal of 21321451046 is 64015412312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5604581 + ... + 5608383.

It is an arithmetic number, because the mean of its divisors is an integer number (816357420).

Almost surely, 2^21321451046 is an apocalyptic number.

21321451046 is a deficient number, since it is larger than the sum of its proper divisors (17863705114).

21321451046 is a wasteful number, since it uses less digits than its factorization.

21321451046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6849 (or 6842 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 21321451046 its reverse (64015412312), we get a palindrome (85336863358).

The spelling of 21321451046 in words is "twenty-one billion, three hundred twenty-one million, four hundred fifty-one thousand, forty-six".