21300470643 has 16 divisors (see below), whose sum is σ = 28453441536. Its totient is φ = 14173934880.

The previous prime is 21300470621. The next prime is 21300470687. The reversal of 21300470643 is 34607400312.

It is not a de Polignac number, because 21300470643 - 2¹² = 21300466547 is a prime.

It is a super-2 number, since 2×21300470643² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21300470643.

It is not an unprimeable number, because it can be changed into a prime (21300470843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4842121 + ... + 4846517.

It is an arithmetic number, because the mean of its divisors is an integer number (1778340096).

Almost surely, 2^21300470643 is an apocalyptic number.

21300470643 is a deficient number, since it is larger than the sum of its proper divisors (7152970893).

21300470643 is a wasteful number, since it uses less digits than its factorization.

21300470643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7034.

The product of its (nonzero) digits is 12096, while the sum is 30.

Adding to 21300470643 its reverse (34607400312), we get a palindrome (55907870955).

The spelling of 21300470643 in words is "twenty-one billion, three hundred million, four hundred seventy thousand, six hundred forty-three".