21243030810 has 16 divisors (see below), whose sum is σ = 50983274016. Its totient is φ = 5664808208.

The previous prime is 21243030797. The next prime is 21243030811. The reversal of 21243030810 is 1803034212.

It is a super-2 number, since 2×21243030810² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21243030811) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 354050484 + ... + 354050543.

It is an arithmetic number, because the mean of its divisors is an integer number (3186454626).

Almost surely, 2^21243030810 is an apocalyptic number.

21243030810 is an abundant number, since it is smaller than the sum of its proper divisors (29740243206).

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

21243030810 is a wasteful number, since it uses less digits than its factorization.

21243030810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708101037.

The product of its (nonzero) digits is 1152, while the sum is 24.

The spelling of 21243030810 in words is "twenty-one billion, two hundred forty-three million, thirty thousand, eight hundred ten".