21203210310 has 64 divisors (see below), whose sum is σ = 51118603200. Its totient is φ = 5628598272.

The previous prime is 21203210299. The next prime is 21203210317. The reversal of 21203210310 is 1301230212.

It is a super-2 number, since 2×21203210310² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21203210310.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203210317) 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 31 ways as a sum of consecutive naturals, for example, 6980112 + ... + 6983148.

It is an arithmetic number, because the mean of its divisors is an integer number (798728175).

Almost surely, 2^21203210310 is an apocalyptic number.

21203210310 is an abundant number, since it is smaller than the sum of its proper divisors (29915392890).

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

21203210310 is a wasteful number, since it uses less digits than its factorization.

21203210310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4025.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21203210310 its reverse (1301230212), we get a palindrome (22504440522).

The spelling of 21203210310 in words is "twenty-one billion, two hundred three million, two hundred ten thousand, three hundred ten".