21010202312 has 32 divisors (see below), whose sum is σ = 43519420800. Its totient is φ = 9429201600.

The previous prime is 21010202309. The next prime is 21010202329. The reversal of 21010202312 is 21320201012.

It is a happy number.

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, 1504139 + ... + 1518042.

It is an arithmetic number, because the mean of its divisors is an integer number (1359981900).

Almost surely, 2^21010202312 is an apocalyptic number.

21010202312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21010202312 is an abundant number, since it is smaller than the sum of its proper divisors (22509218488).

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

21010202312 is a wasteful number, since it uses less digits than its factorization.

21010202312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3022277 (or 3022273 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21010202312 its reverse (21320201012), we get a palindrome (42330403324).

It can be divided in two parts, 21010 and 202312, that added together give a palindrome (223322).

The spelling of 21010202312 in words is "twenty-one billion, ten million, two hundred two thousand, three hundred twelve".