21231111312010 has 8 divisors (see below), whose sum is σ = 38216000361636. Its totient is φ = 8492444524800.

The previous prime is 21231111311987. The next prime is 21231111312023. The reversal of 21231111312010 is 1021311113212.

It can be written as a sum of positive squares in 2 ways, for example, as 20180426861169 + 1050684450841 = 4492263^2 + 1025029^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 1061555565591 + ... + 1061555565610.

Almost surely, 2^{21231111312010} is an apocalyptic number.

21231111312010 is a deficient number, since it is larger than the sum of its proper divisors (16984889049626).

21231111312010 is a wasteful number, since it uses less digits than its factorization.

21231111312010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2123111131208.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 21231111312010 its reverse (1021311113212), we get a palindrome (22252422425222).

The spelling of 21231111312010 in words is "twenty-one trillion, two hundred thirty-one billion, one hundred eleven million, three hundred twelve thousand, ten".